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In an effort to further elucidate the structural requirements of this series of inhibitors , we detail in this study a structure - activity relationship ( SAR ) built on screening hit 1 , which expands on our initial pharmacophore model .
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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:
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