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The results showed that WFI inhibited the mutagenicity of 2 - aminoanthracene ( 2 - AA ) , an indirect mutagen ; and 4 - nitroquinoline - N - oxide ( 4 - NQO ) , a direct mutagen toward Salmonella typhimurium TA 98 and TA 100 .
 Chemical: 2 - aminoanthracene; Chemical: 2 - AA; Chemical: 4 - nitroquinoline - N - oxide; Chemical: 4 - NQO
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 2 - aminoanthracene; Chemical: 2 - AA; Chemical: 4 - nitroquinoline - N - oxide; Chemical: 4 - NQO