[A polycyclic aromatic hydrocarbon belongs to the family of mutagen benzo(a)pyrene. 1-nitrobenzo(a)pyrene consists of five fused rings with a nitro-group attached to the first carbon atom of the aromatic hydrocarbon ring in with potential carcinogenicity. ( NCI )] (UMLS (NCI) C0044504) =Organic Chemical; Hazardous or Poisonous Substance ;