28910
In its standard application , LiGen modules are used to define input constraints , either structure - based , through active site identification , or ligand - based , through pharmacophore definition , to docking and to de novo generation .
 None
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