19101
Calculations show that this feature , which arises from a precursor to the isomer , is a charge - transfer transition of a contact pair between the nascent Br fragment and a nearby CHBr3 molecule .
 Chemical: Br; Chemical: CHBr3
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: Br, CHBr3 
Answer:
 Chemical: Br; Chemical: CHBr3