16759
Combined nano zinc oxide and titanium dioxide [ nano ( ZnO - TiO ( 2 ) ) ] has been reported first time for the synthesis of novel series of 4 , 5 , 6 , 7 - tetrahydro - 6 - ( ( 5 - substituted - 1 , 3 , 4 - oxadiazol - 2 - yl ) methyl ) thieno [ 2 , 3 - c ] pyridine .
 Chemical: zinc oxide; Chemical: titanium dioxide; Chemical: ZnO; Chemical: TiO ( 2 ); Chemical: 4 , 5 , 6 , 7 - tetrahydro - 6 - ( ( 5 - substituted - 1 , 3 , 4 - oxadiazol - 2 - yl ) methyl ) thieno [ 2 , 3 - c ] pyridine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: zinc oxide; Chemical: titanium dioxide; Chemical: ZnO; Chemical: TiO ( 2 ); Chemical: 4 , 5 , 6 , 7 - tetrahydro - 6 - ( ( 5 - substituted - 1 , 3 , 4 - oxadiazol - 2 - yl ) methyl ) thieno [ 2 , 3 - c ] pyridine