9724
An X - ray structure study revealed a hydrogen bonding pattern of aminopyrimidine derivatives .
 Chemical: hydrogen; Chemical: aminopyrimidine
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, aminopyrimidine 
Answer:
 Chemical: hydrogen; Chemical: aminopyrimidine