21165
The fragment indole - 6 - carboxylic acid ( 1F1 ) , previously identified as a flap site binder in a fragment - based screen against HIV protease ( PR ) , has been cocrystallized with pepstatin - inhibited PR and with apo - PR .
 Chemical: indole - 6 - carboxylic acid; Chemical: pepstatin
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: indole - 6 - carboxylic acid; Chemical: pepstatin