30146
Six new thiol - conjugated metabolites ( M16 - M21 ) , together with previously reported ones , were identified by LC / MS .
 Chemical: thiol
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: thiol 
Answer:
 Chemical: thiol