9964
Conformations of one such chemotype ( 1aaa ; all methyl side - chains ) matched several biomedically significant PPIs , including the dimerization interface of HIV - 1 protease .
 Chemical: methyl
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: methyl