20125
Both [ R , R ] - and [ S , S ] - isomers exerted similar mutagenicity and carcinogenicity but were less potent than 6 - NC .
 Chemical: 6 - NC
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: 6 - NC 
Answer:
 Chemical: 6 - NC