9153
Possible reasons are discussed regarding why the Pn are better gelators than the corresponding naphthyl analogues ( Nn ) which had been investigated previously .
 Chemical: naphthyl
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: naphthyl 
Answer:
 Chemical: naphthyl