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One pot synthesis and biological activity evaluation of novel Schiff bases derived from 2 - hydrazinyl - 1 , 3 , 4 - thiadiazole .
 Chemical: Schiff bases; Chemical: 2 - hydrazinyl - 1 , 3 , 4 - thiadiazole
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: Schiff bases; Chemical: 2 - hydrazinyl - 1 , 3 , 4 - thiadiazole