18925
These compounds were evaluated for their acetylcholinesterase ( AChE ) inhibitory activity and 5 - amino - 2 , 7 - bis ( 4 - methoxyphenyl ) - 2 , 3 - dihydrobenzo [ b ] thiophene - 4 , 6 - dicarbonitrile was found to be the most potent against AChE with IC50 4 . 16 mu mol / L .
 Chemical: 5 - amino - 2 , 7 - bis ( 4 - methoxyphenyl ) - 2 , 3 - dihydrobenzo [ b ] thiophene - 4 , 6 - dicarbonitrile
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: 5 - amino - 2 , 7 - bis ( 4 - methoxyphenyl ) - 2 , 3 - dihydrobenzo [ b ] thiophene - 4 , 6 - dicarbonitrile