28082
Radiosynthesis of [ ( 11 ) C ] N - ethyl - 2 - ( N - ( 6 - methoxypyridin - 3 - yl ) - 2 - methylphenylsulfonamido ) - N - ( pyridin - 3 - ylmethyl ) acetamide ( [ ( 11 ) C ] EMPA ) , and evaluation as a potential PET tracer for OX2 receptors is described .
 Chemical: [ ( 11 ) C ] N - ethyl - 2 - ( N - ( 6 - methoxypyridin - 3 - yl ) - 2 - methylphenylsulfonamido ) - N - ( pyridin - 3 - ylmethyl ) acetamide; Chemical: [ ( 11 ) C ] EMPA
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: [ ( 11 ) C ] N - ethyl - 2 - ( N - ( 6 - methoxypyridin - 3 - yl ) - 2 - methylphenylsulfonamido ) - N - ( pyridin - 3 - ylmethyl ) acetamide, [ ( 11 ) C ] EMPA 
Answer:
 Chemical: [ ( 11 ) C ] N - ethyl - 2 - ( N - ( 6 - methoxypyridin - 3 - yl ) - 2 - methylphenylsulfonamido ) - N - ( pyridin - 3 - ylmethyl ) acetamide; Chemical: [ ( 11 ) C ] EMPA