20019
Further , a pharmacophore based QSAR model was established to understand the crucial molecular features of 3 , 3 ' - diindolylmethanes essential for potent antileishmanial activity .
 Chemical: 3 , 3 ' - diindolylmethanes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 3 , 3 ' - diindolylmethanes