15023
Synthesis of 2 , 5 - disubstituted - 1 , 3 , 4 - oxadiazole ( 2a - c ) , 3 - substituted aminomethyl - 5 - substituted - 1 , 3 , 4 - oxadiazole - 2 ( 3H ) - thione ( 4a - m ) and 2 - substituted thio - 5 - substituted - 1 , 3 , 4 - oxadiazole ( 5a , b ) had been described .
 Chemical: 2 , 5 - disubstituted - 1 , 3 , 4 - oxadiazole; Chemical: 3 - substituted aminomethyl - 5 - substituted - 1 , 3 , 4 - oxadiazole - 2 ( 3H ) - thione; Chemical: 2 - substituted thio - 5 - substituted - 1 , 3 , 4 - oxadiazole
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: 2 , 5 - disubstituted - 1 , 3 , 4 - oxadiazole; Chemical: 3 - substituted aminomethyl - 5 - substituted - 1 , 3 , 4 - oxadiazole - 2 ( 3H ) - thione; Chemical: 2 - substituted thio - 5 - substituted - 1 , 3 , 4 - oxadiazole