28966
It could be ascribed to relative hydrogen - bonding acceptor strengths of N - vinylpyrrolidone moiety in the polymer molecules .
 Chemical: hydrogen; Chemical: N - vinylpyrrolidone
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: hydrogen, N - vinylpyrrolidone 
Answer:
 Chemical: hydrogen; Chemical: N - vinylpyrrolidone