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In order to understand the structure - activity correlation of falcipain - 2 inhibitors , a set of ligand - and receptor - based 3D - QSAR models were , for the first time , developed in the present work employing Comparative Molecular Field Analysis ( CoMFA ) and Comparative Molecular Similarity Index Analysis ( CoMSIA ) for 240 promising molecules .
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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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