28898
Structures of the new compounds , including the absolute configurations , were determined by spectroscopic and chemical methods as ( - ) - nectandrin B - beta - d - glucopyranoside ( 1 ) , ( - ) - ( 7R , 7 ' R , 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' - dimethoxy - 7 , 7 ' - epoxylignan - 4 - O - beta - d - glucopyranoside ( 2 ) , ( - ) - ( 7R , 7 ' R , 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' - dimethoxy - 7 , 7 ' - epoxylignan - 4 ' - O - beta - d - glucopyranoside ( 3 ) , ( - ) - ( 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' , 5 ' - trimethoxylignan - 4 ' - O - beta - d - glucopyranoside ( 4 ) , ( - ) - ( 7R , 8R ) - syringylglycerol - 8 - O - beta - d - glucopyranoside ( 5 ) , and ( - ) - 3 - hydroxy - 2 - methyl - 4 - pyrone - 3 - O - beta - d - xylopyranosyl - ( 1 --> 6 ) - O - beta - d - glucopyranoside ( 6 ) , respectively .
 ( - ) - nectandrin B - beta - d - glucopyranoside, ( - ) - ( 7R , 7 ' R , 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' - dimethoxy - 7 , 7 ' - epoxylignan - 4 - O - beta - d - glucopyranoside, ( - ) - ( 7R , 7 ' R , 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' - dimethoxy - 7 , 7 ' - epoxylignan - 4 ' - O - beta - d - glucopyranoside, ( - ) - ( 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' , 5 ' - trimethoxylignan - 4 ' - O - beta - d - glucopyranoside, ( - ) - ( 7R , 8R ) - syringylglycerol - 8 - O - beta - d - glucopyranoside, ( - ) - 3 - hydroxy - 2 - methyl - 4 - pyrone - 3 - O - beta - d - xylopyranosyl - ( 1 --> 6 ) - O - beta - d - glucopyranoside
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( - ) - nectandrin B - beta - d - glucopyranoside, ( - ) - ( 7R , 7 ' R , 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' - dimethoxy - 7 , 7 ' - epoxylignan - 4 - O - beta - d - glucopyranoside, ( - ) - ( 7R , 7 ' R , 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' - dimethoxy - 7 , 7 ' - epoxylignan - 4 ' - O - beta - d - glucopyranoside, ( - ) - ( 8S , 8 ' R ) - 4 , 4 ' - dihydroxy - 3 , 3 ' , 5 ' - trimethoxylignan - 4 ' - O - beta - d - glucopyranoside, ( - ) - ( 7R , 8R ) - syringylglycerol - 8 - O - beta - d - glucopyranoside, ( - ) - 3 - hydroxy - 2 - methyl - 4 - pyrone - 3 - O - beta - d - xylopyranosyl - ( 1 --> 6 ) - O - beta - d - glucopyranoside