16029
A large number of aromatic / heterocyclic sulfonamides and some 5 - mercapto - 1 , 3 , 4 - thiadiazoles were investigated as TcCA inhibitors .
 Chemical: aromatic / heterocyclic sulfonamides; Chemical: 5 - mercapto - 1 , 3 , 4 - thiadiazoles
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: aromatic / heterocyclic sulfonamides, 5 - mercapto - 1 , 3 , 4 - thiadiazoles 
Answer:
 Chemical: aromatic / heterocyclic sulfonamides; Chemical: 5 - mercapto - 1 , 3 , 4 - thiadiazoles