24072
Here , a small focused library ( 4a - 4f ) was developed around lead inhibitor 1c to investigate the requirement of an amidine - linked thiophene in the inhibitor scaffold .
 Chemical: amidine; Chemical: thiophene
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: amidine; Chemical: thiophene