24927
The first region probes the CH stretching modes of DNP films , and the latter explores the vibrational nonlinear activity of the 2 , 4 - dinitroaniline moiety of the polar head of the lipid .
 Chemical: CH; Chemical: 2 , 4 - dinitroaniline
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: CH, 2 , 4 - dinitroaniline 
Answer:
 Chemical: CH; Chemical: 2 , 4 - dinitroaniline