18557
Evaluation of difluoromethyl ketones as agonists of the gamma - aminobutyric acid type B ( GABAB ) receptor .
 Chemical: difluoromethyl ketones; Chemical: gamma - aminobutyric acid
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: difluoromethyl ketones, gamma - aminobutyric acid 
Answer:
 Chemical: difluoromethyl ketones; Chemical: gamma - aminobutyric acid