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Specific features of LiGen are the use of a pharmacophore - based docking procedure which allows Flexible docking without conformer enumeration and accurate and flexible reactant mapping coupled with reactant tagging through substructure searching .
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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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