nitrobenzene organyl group p-nitrophenyl group An aryl group obtained via removal of the hydrogen atom from the 4-position of nitrobenzene. C=1C=C(C=CC1*)[N+]([O-])=O p-nitrophenyl chebi_ontology 4-nitrophenyl group 122.02420 C6H4NO2 4-nitrophenyl CHEBI:61595 122.10150 0 PMID:15267227