30622
Synthetic tactics of new class of 4 - aminothieno [ 2 , 3 - d ] pyrimidine - 6 - carbonitrile derivatives acting as antimicrobial agents .
 4 - aminothieno [ 2 , 3 - d ] pyrimidine - 6 - carbonitrile
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 4 - aminothieno [ 2 , 3 - d ] pyrimidine - 6 - carbonitrile