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Another fragment , 3 - indolepropionic acid ( 1F1 - N ) , predicted by AutoDock calculations and confirmed in a novel inhibition of nucleation crystallization assay , exploits the same interactions in the flap site in two crystal structures .
 Chemical: 3 - indolepropionic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 3 - indolepropionic acid