polyethylene glycol units are used to indicate low polyethylene glycol . generally , the number of the included polyethylene glycol units is used to indicate low polyethylene glycol , the number of polyethylene glycol units is an integer of 0 - 20 , preferably an integer of 3 - 10 . the polyethylene glycol in the present invention includes derivatives and analogues of polyethylene glycol and may be substituted by one of the following hydrophilic polymers , which is selected from a group consisting of polyethylene glycol , polyglutamic acid , polyaspartic acid , polypropylene glycol , polyvinyl alcohol , polypropylene morpholine , polyoxazolone and copolymers thereof . the conjugate of the present invention may be administered in a form of a pure compound or a suitable drug composition , in any acceptable administration manner , or used for a reagent with similar use . therefore , the employed administration manner may be selected from oral administration , intranasal administration , non - intestinal administration , local administration , percutaneous administration or rectum administration , administration takes a form of solid , semisolid or liquid medicament , e . g ., tablet , suppository , pill , soft and hard gelatin capsule , powder , solution , suspension or aerosol , and preferably employs a unit dosage enabling simple administration with an accurate dosage . the composition may include a conventional drug carrier or excipient and the conjugate of the present invention as an active component ( one or more kinds ), and additionally may comprise other medicaments , carriers , adjuvants and the like . usually , according to the desired administration manner , the pharmaceutically acceptable composition will include about 1 to 99 weight percent conjugate of the present invention , and 99 - 1 weight percent suitable medical excipient . preferably , the composition includes about 5 - 75 weight percent conjugate of the present invention , with the balance being a suitable medical excipient . according to the drug composition that may be administered in form of a liquid , for example , the conjugate ( about 0 . 5 - about 20 %) of the present invention and selectively - existing medicinal adjuvants are solved and dispersed in a carrier by a solving and dispersing means to form a solution or suspension , wherein examples of the carrier is water , saline , glucose hydrate , glycerol , ethanol or the like . if necessary , the drug composition of the present invention may further include a small amount of assistant substance such as a wetting agent or emulsifier , ph buffering agent , and antioxidant , for example , citric acid , sorbitan monolaurate , trithanolamine oleate , butylated hydroxytoluene . the following examples are used to illustrate the present invention , but not used to limit the present invention . sumatriptan used in the examples are provided by jiangsu ocean biological engineering co ., ltd , dasatinib is provided by nanjing ange pharmaceutical and chemical co ., ltd , metoxyethoxymethyl chloride ( memcl ) is provided by alfa aesar , paratoluensulfonyl chloride is purposed from shandong yilong industrial co ., ltd , sodium hydride is purchased from tci ( shanghia ) chemical industry development co ., ltd ., and h ( och 2 ch 2 ) 4 — oh , h ( och 2 ch 2 ) 6 — oh and h ( och 2 ch 2 ) 12 — oh are purchased from jiaxing bomei biotechnology co ., ltd . other reagents used in examples of the present invention all are reagents available in the market . hexaethyleneglycol ( 1 ) ( 2 . 5 ml , 10 mmol ) is dissolved in 50 ml dichloromethane , triethylamine ( 4 . 17 ml , 10 mmol ) is added , methanesulfonyl chloride ( 1 . 72 ml , 22 mmol ) is dripped in , and reaction continues 16 hours at a room temperature under nitrogen gas protection . 1 . 2 ml methanol is added and stirred 15 minutes , filtering is performed to remove solid to concentrate to obtain 3 . 85 g product ( 2 ), with a yield rate 99 %, which is directly used for next reaction . hexaethyleneglycol disulfonate ( 2 ) ( 3 . 85 g , 10 mmol ) and 13 . 3 g tetrabutyl ammonium bromide are dissolved in acetonitrile 50 ml , and stirred and react 16 hours under nitrogen gas protection . solvent is evaporated out , acetic ether and water are added for extraction , extract is dried by using anhydrous sodium sulfate , concentrates and goes through column separation to obtain 2 . 85 g product ( 3 ), with a yield rate 80 %. 1 h - nmr ( cdcl 3 ): 3 . 82 ( t , 4h ), 3 . 67 ( s , 16h ), 3 . 48 ( t , 4h ). sumatriptan ( 236 mg , 0 . 8 mmol ) is dissolved in 2 ml dry dmf , 60 % nah ( 32 mg , 0 . 8 mmol ) is added , stirred and react 15 minutes , then the compound ( 3 ) ( 163 . 2 mg , 0 . 4 mmol ) is added , and reaction is performed overnight under nitrogen gas protection . water is added to the above reaction liquid to quench the reaction , extraction is performed three times by using acetic ether , an organic phase is dried by using anhydrous sodium sulfate , concentrate goes through column separation to obtain 240 mg product , with a yield rate 61 %. 1 h - nmr ( cdcl 3 ): 2 . 34 ( s , 12h ), 2 . 63 ( t , 4h ), 2 . 77 ( s , 6h ), 2 . 93 ( t , 4h ), 3 . 13 ( t , 4h ), 3 . 44 ( t , 4h ), 3 . 51 ( s , 16h ), 4 . 34 ( s , 4h ), 6 . 98 ( s , 2h ), 7 . 14 ( d , 2h ), 7 . 26 ( d , 2h ), 7 . 57 ( s , 2h ), 8 . 91 ( s , 2h ). pentaethyleneglycol ( 2 . 38 g , 10 mmol ) is dissolved in 50 ml dichloromethane , triethylamine ( 4 . 16 ml , 10 mmol ) is added , methanesulfonyl chloride ( 1 . 77 ml , 22 mmol ) is dripped in , and reaction continues 16 hours at a room temperature under nitrogen gas protection . 1 . 2 ml methanol is added and stirred 15 minutes , filtering is performed to remove solid to concentrate to obtain 3 . 94 g product , with a yield rate 99 %, which is directly used for next reaction . pentaethyleneglycol disulfonate ( 3 . 94 g , 10 mmol ) and 13 . 3 g tetrabutyl ammonium bromide are dissolved in acetonitrile 50 ml , and stirred and react 16 hours under nitrogen gas protection . solvent is evaporated out , acetic ether and water are added for extraction , extract is dried by using anhydrous sodium sulfate , concentrates and goes through column separation to obtain 2 . 73 g product , with a yield rate 75 %. 1 h - nmr ( cdcl 3 ): 3 . 49 ( t , 4h ), 3 . 69 ( s , 12h ), 3 . 84 ( t , 4h ). sumatriptan ( 236 mg , 0 . 8 mmol ) is dissolved in 2 ml dry dmf , 60 % nah ( 32 mg , 0 . 8 mmol ) is added , stirred and react 15 minutes , triethylene glycol 2 - bromoethyl ( 145 . 6 mg , 0 . 4 mmol ) is added , and reaction is performed overnight under nitrogen gas protection . water is added to the above reaction liquid to quench the reaction , extraction is performed three times by using acetic ether , an organic phase is dried by using anhydrous sodium sulfate , concentrate goes through column separation to obtain 184 mg product , with a yield rate 58 %. 1 h - nmr ( cdcl 3 ): 2 . 34 ( s , 12h ), 2 . 70 ( t , 4h ), 2 . 72 ( s , 6h ), 2 . 94 ( t , 4h ), 3 . 06 ( t , 4h ), 3 . 40 ( t , 4h ), 3 . 49 ( s , 12h ), 4 . 35 ( s , 4h ), 6 . 98 ( s , 2h ), 7 . 11 ( d , 2h ), 7 . 23 ( d , 2h ), 7 . 60 ( s , 2h ), 8 . 91 ( s , 2h ). triethyleneglycol ( 2 . 67 ml , 20 mmol ) is dissolved in 50 ml dichloromethane , triethylamine ( 8 . 33 ml , 20 mmol ) is added , methanesulfonyl chloride ( 3 . 44 ml , 44 mmol ) is dripped in , and reaction continues 16 hours at a room temperature under nitrogen gas protection . 1 . 2 ml methanol is added and stirred 15 minutes , filtering is performed to remove solid to concentrate to obtain 6 . 12 g product , with a yield rate 99 %, which is directly used for next reaction . triethyleneglycol disulfonate ( 4 . 12 g , 13 . 46 mmol ) and 17 . 3 g tetrabutyl ammonium bromide are dissolved in acetonitrile 50 ml , and stirred and react at 50 ° c . 16 hours under nitrogen gas protection . solvent is evaporated out , acetic ether and water are added for extraction , extract is dried by using anhydrous sodium sulfate , concentrates and goes through column separation to obtain 2 . 84 g product , with a yield rate 77 %. 1 h - nmr ( cdcl 3 ): 3 . 49 ( t , 4h ), 3 . 70 ( s , 4h ), 3 . 84 ( t , 4h ). sumatriptan ( 236 mg , 0 . 8 mmol ) is dissolved in 2 ml dry dmf , 60 % nah ( 32 mg , 0 . 8 mmol ) is added , stirred and react 15 minutes , then ethylene glycol 2 - bromoethyl ( 109 . 6 mg , 0 . 4 mmol ) is added , and reaction is performed overnight under nitrogen gas protection . water is added to the above reaction liquid to quench the reaction , extraction is performed three times by using acetic ether , an organic phase is dried by using anhydrous sodium sulfate , concentrate goes through column separation to obtain a product , with a yield rate 61 %. 1 h - nmr ( cdcl 3 ): 2 . 35 ( s , 12h ), 2 . 66 ( t , 4h ), 2 . 72 ( s , 6h ), 2 . 94 ( t , 4h ), 3 . 07 ( t , 4h ), 3 . 40 ( t , 4h ), 3 . 47 ( s , 4h ), 4 . 34 ( s , 4h ), 6 . 98 ( s , 2h ), 7 . 12 ( d , 2h ), 7 . 23 ( d , 2h ), 7 . 60 ( s , 2h ), 8 . 91 ( s , 2h ). 19 . 1 g paratoluensulfonyl chloride and 40 ml pyridine are added in 250 ml three - neck flask , and cooled to 0 ° c . 9 . 7 g ho - peg ( n = 4 )- oh is mixed uniformly with 20 ml pyridine , and then dripped in the three - neck flash , and the temperature is controlled between 0 and 10 ° c . stirring and reaction is continued at this temperature for two hours . tlc monitors that the reaction is complete . 300 ml cold water and 60 ml concentrated hydrochloric acid are added in the reaction liquid and slowly stirred for half an hour , then the reaction liquid is transferred into a 500 ml separating funnel , acetic ether is added to extract twice ( 300 ml + 200 ml ). the organic layers are merged and washed by water to neutrality , dried by anhydrous sodium sulfate for two hours . a rotary evaporator evaporates out solvent to obtain 21 . 4 g viscous liquid , which will be directly used for next reaction . 487 g dasatinib and 166 mg potassium carbonate are added into a 100 ml three - neck flask filled with 20 ml acetonitrile , and stirred at a room temperature for two hours . 10 ml acetonitrile solution in which 258 mg tso - peg ( n = 4 )- ots is dissolved is added to the reaction flask , and reflex reacts overnight . tlc monitors that the reaction is complete . column separation is carried out to obtain 308 mg white solid with a yield rate 54 . 5 %. m / z [ mh ] + 1133 . 1 h - nmr ( dmso - d6 ): 2 . 23 ( s , 6h ), 2 . 49 ( s , 6h ), 2 . 51 ( m , 8h ), 3 . 53 ( m , 32h ), 6 . 04 ( s , 2h ), 7 . 27 ( m , 4h ), 7 . 40 ( m , 2h ), 8 . 22 ( s , 2h ), 9 . 88 ( s , 2h ), 11 . 48 ( s , 2h ). 9 . 6 g paratoluensulfonyl chloride and 40 ml pyridine are added in 250 ml three - neck flask , and cooled to 0 ° c . 12 . 6 g mpeg ( n = 5 )- oh is mixed uniformly with 20 ml pyridine , and then dripped in the three - neck flash , and the temperature is controlled between 0 and 10 ° c . stirring and reaction is continued at this temperature for two hours . tlc monitors that the reaction is complete . 300 ml cold water and 60 ml concentrated hydrochloric acid are added in the reaction liquid and slowly stirred for half an hour , then the reaction liquid is transferred into a 1000 ml separating funnel , acetic ether is added to extract twice ( 300 ml + 200 ml ). the organic layers are merged and washed by water to neutrality , dried by anhydrous sodium sulfate for two hours . a rotary evaporator evaporates out solvent to obtain 21 . 5 g viscous liquid , which will be directly used for next reaction . 253 g dasatinib and 128 mg potassium carbonate are added into a 100 ml three - neck flask filled with 20 ml acetonitrile , and stirred at a room temperature for two hours . 10 ml acetonitrile solution in which 205 mg mpeg ( n = 5 ) ots is dissolved is added to the reaction flask , and reflex reacts overnight . tlc monitors that the reaction is complete . column separation is carried out to obtain 205 mg white solid with a yield rate 56 . 8 %. m / z [ mh ] + 722 . 1 h - nmr ( dmso - d6 ): 2 . 24 ( s , 3h ), 2 . 43 ( s , 3h ), 2 . 51 ( m , 8h ), 3 . 22 ( s , 3h ), 3 . 61 ( m , 20h ), 6 . 05 ( s , 1h ), 7 . 27 ( m , 2h ), 7 . 41 ( m , 1h ), 8 . 22 ( s , 1h ), 9 . 88 ( s , 1h ), 11 . 48 ( s , 1h ). 19 . 1 g paratoluensulfonyl chloride and 40 ml pyridine are added in 500 ml three - neck flask , and cooled to 0 ° c . 14 . 1 g ho - peg ( n = 6 )- oh is mixed uniformly with 20 ml pyridine , and then dripped in the three - neck flash , and the temperature is controlled between 0 and 10 ° c . stirring and reaction is continued at this temperature for two hours . tlc monitors that the reaction is complete . 300 ml cold water and 60 ml concentrated hydrochloric acid are added in the reaction liquid and slowly stirred for half an hour , then the reaction liquid is transferred into a 1000 ml separating funnel , acetic ether is added to extract twice ( 300 ml + 200 ml ). the organic layers are merged and washed by water to neutrality , dried by anhydrous sodium sulfate for two hours . a rotary evaporator evaporates out solvent to obtain 28 . 7 g viscous liquid , which will be directly used for next reaction . 506 g dasatinib is dissolved in 6 ml n , n - dimethylformamide , 160 mg nah is added , and stirred at a room temperature for one hour . 302 mg tso - peg ( n = 6 )- ots is added for reaction at a room temperature for 20 hours . tlc monitors that the reaction is complete . column separation is carried out to obtain 316 mg white solid with a yield rate 51 . 8 %. m / z [ mh ] + 1221 . 1 h - nmr ( dmso - d6 ): 2 . 19 ( s , 6h ), 2 . 28 ( s , 6h ), 2 . 49 ( m , 8h ), 3 . 61 ( m , 40h ), 6 . 04 ( s , 2h ), 7 . 20 ( m , 4h ), 7 . 41 ( m , 2h ), 8 . 18 ( s , 2h ), 9 . 87 ( s , 2h ), 11 . 46 ( s , 2h ). nonaethyleneglycol monomethyl ( 4 . 28 g , 10 mmol ) is dissolved in 50 ml dichloromethane , triethylamine ( 4 . 16 ml , 10 mmol ) is added , methanesulfonyl chloride ( 0 . 9 ml , 11 mmol ) is dripped in , and reaction continues 16 hours at a room temperature under nitrogen gas protection . 1 . 2 ml methanol is added and stirred 15 minutes , filtering is performed to remove solid to concentrate to obtain a product , which is directly used for next reaction . the above obtained product and 6 . 80 g tetrabutyl ammonium bromide are dissolved in 50 ml acetonitrile , and stirred and react at 50 ° c . for 16 hours under nitrogen gas protection . solvent is evaporated out , acetic ether and water are added for extraction , extract is dried by using anhydrous sodium sulfate , concentrates and goes through column separation to obtain 3 . 38 g product , with a yield rate 68 %. dorzolamide ( 324 mg , 1 mmol ) is dissolved in 2 ml dry dmf , 60 % nah ( 40 mg , 1 mmol ) is added , stirred and react 15 minutes , an intermediate ( 491 mg , 1 mmol ) is added , and reaction is performed overnight under nitrogen gas protection . water is added to the above reaction liquid to quench the reaction , extraction is performed three times by using acetic ether , an organic phase is dried by using anhydrous sodium sulfate , concentrate goes through column separation to obtain 352 mg product , with a yield rate 48 %. m / z [ mh ] + 735 . reference is made to example 6 for the syntheses method . m / z [ mh ]+ 895 . h ( och 2 ch 2 ) 12 — oh is used to substitute hexaethyleneglycol . reference is made to example 6 for the syntheses method . m / z [ mh ] + 1159 . reference is made to example 6 for the syntheses method . m / z [ mh ] + 1157 . regarding syntheses of the compound l , please refer to j . org . chem . 2006 , 71 , 9884 - 9886 . reference is made to example 6 for the syntheses method . m / z [ mh ] + 1818 . regarding syntheses of the four - branch ethyleneglycol , please refer to bulletin of academy of sciences of the ussr , division of chemical science ( english translation ); vol . 38 ; nb . 10 ; ( 1989 ); p . 2207 . reference is made to example 6 for the syntheses method . m / z [ mh ] + 1538 . regarding syntheses of the compound r , please refer to j . org . chem . 2006 , 71 , 9884 - 9886 . reference is made to example 6 for the syntheses method . m / z [ mh ] + 2490 . inhibition of dasatinib series compounds for cell proliferation and ic50 measurement detection is performed for the function of three kinds of drugs for proliferation of tumor cells k562 , ku812 , sup - b15 , and pc - 3 , to determine its 50 % inhibition centration ( ic50 ). cells are cultured under a complete culture medium ; when cells are attached to the wall , drug of different concentrations is added in each tumor cell line for treatment , and a positive control , a blank control and a solvent control are set . cells are incubated for 72 hours and then ctg method is used for detection . caco - 2 is an epithelial cell of human colon cancer , it may differentiate and grow on its own into epithelial cell monolayer having a structure and function similar to small intestine and represented with an active transportor and partial metabolic enzyme , and is a good model for evaluating in vitro membrane permeability . according to a standard culture procedure of the caco - 2 cell , a cell monolayer is prepared on a transwell culture insert , a culture hole having a transmembrane resistance greater than 300 ω · cm 2 is selected to perform a transmembrane experiment , and positive quality control drugs atenolol ( which can penetrate the membrane difficulty ) and methyltestosterone ( which can penetrate the membrane easily ) are selected in parallel to perform necessary quality control for the experimental system . 400 μl quality control drug ( atenolol or methyltestosterone ) or a drug to be tested is added respectively into holes of an upper pond of the culture insert , 500 μl hank &# 39 ; s liquid pre - incubated at 37 ° c . is added in a lower pond , incubation is performed in co 2 incubator for 90 min , the solution of the lower pond is collected , quantitatively processed and measured to calculate its appearance penetration coefficient ( papp ): wherein dq is an accumulated penetration amount of a drug receiving pond with a measure unit μmol ; dt is incubation time with a measure unit min ; a is a diffusion area with a measure unit cm 2 ; c 0 is an initial administration concentration of an administrating pond with a measure unit μmol · l − 1 ; papp has a measure unit cm / s . a universal standard for evaluating caco - 2 cell transmembrane transport penetration is that papp & gt ; 100 × 10 − 6 indicates a compound which penetrates the membrane easily ; 100 × 10 − 6 & gt ; papp & gt ; 10 × 10 − 6 indicates a compound which penetrates the membrane at a medium level ; papp & lt ; 10 × 10 − 6 indicates a compound that penetrates the membrane difficulty . an evaluation objective of the bidirectional transport is to preliminary observe that the transmembrane transport of the object to be tested has active transport procedure mediated by an efflux transporter . positive quality - control drug digoxin and a drug to be tested are added respectively in holes of the upper pond or lower pond of the culture insert , hank &# 39 ; s liquid pre - incubated at 37 ° c . is added in an opposite pond , incubation is performed in co 2 incubator for 90 min , the solution of the opposite pond is collected , quantitatively processed and measured to calculate its appearance penetration coefficient ( pappa - b and pappb - a ) according to the above formula and a ratio of the two ; when the ratio is & gt ; 2 , it is prompted that the transmembrane transport of the compound might involve active transport mediated by an efflux transporter . the drug in plasma is enabled to reach a steady state by using a rat model in a manner of injection at an even speed , to see a ratio value ( kp value ) of a drug concentration in the plasma and a drug concentration in brain tissue upon the steady state , to represent a distribution capability of the drug in the brain tissue . it is characterized by reliable data , direct provision of blood / brain distribution ratio value of the compound , and saving of animals and dosage . research results show that the blood - brain barrier permeability of the three compounds is all lower than sumatriptan , wherein the blood - brain barrier permeability of smqt - 01 compound is 1 / 50 of sumatriptan , the blood - brain barrier permeability of smqt - 02 compound is 1 / 37 of sumatriptan , and the blood - brain barrier permeability of smqt - 03 compound is 1 / 13 of sumatriptan . research results show that the blood - brain barrier permeability of the three compounds is all lower than dasatinib , wherein the blood - brain barrier permeability of dstn - 42 compound is 1 / 18 of dasatinib , the blood - brain barrier permeability of dstn - 51 compound is 1 / 23 of dasatinib , and the blood - brain barrier permeability of dstn - 62 compound is 1 / 33 of dasatinib . research results show that the blood - brain barrier permeability of seven compounds is all lower than dorzolamide , wherein the blood - brain barrier permeability of dza - 01 compound is 1 / 55 of dorzolamide , the blood - brain barrier permeability of dza - 02 compound is 1 / 34 of dorzolamide , the blood - brain barrier permeability of dza - 03 compound is 1 / 65 of dorzolamide , the blood - brain barrier permeability of dza - 04 compound is 1 / 12 of dorzolamide , the blood - brain barrier permeability of dza - 05 compound is 1 / 28 of dorzolamide , the blood - brain barrier permeability of dza - 06 compound is ⅛ of dorzolamide , and the blood - brain barrier permeability of dza - 07 compound is 1 / 27 of dorzolamide . groups of the experiment : intravenous injection group and oral administration group , four rats being provided for each rat data processing : an area under a curve is calculated for intravenous injection and oral administration by using a trapezoidal method , and a bioavailability is calculated by using the following formula : research results show that absolute bioavailability of smqt - 01 compound is 17 %, absolute bioavailability of smqt - 02 compound is 23 %, and absolute bioavailability of smqt - 03 compound is 25 %.
provided are polyethylene glycol drug conjugates of general formula , or and pharmaceutical compositions and a use thereof . the conjugates are formed by combining low molecular weight polyethylene glycol with 2 - 4 drug molecules . the conjugates can interact with receptor dimers or polymers , thereby improving the in vivo distribution of the drug , changing the oil and water distribution coefficient , enhancing the pharmacological activity , reducing the blood - brain barrier permeability of the drug , and improving the bioavailability of the drug .