9965
On the basis of these observations , four molecules 1 with side - chains corresponding to the matching HIV - 1 dimerization interface regions were prepared ; all four inhibited HIV - 1 protease via perturbation of dimerization .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None