23924
The present preliminary work focuses only on the efficient grafting of benzyl and allyl moieties .
 Chemical: benzyl; Chemical: allyl
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: benzyl, allyl 
Answer:
 Chemical: benzyl; Chemical: allyl