Synonyms : (4-Hydroxy-3-iodo-5-nitrophenyl)acetyl, (4-Hydroxy-5-iodo-3-nitrophenyl)acetyl, 5-Iodo-4-hydroxy-3-nitrophenacetyl, Hydroxyiodonitrophenylacetate, NIP Acetyl Hapten, 5 Iodo 4 hydroxy 3 nitrophenacetyl, Acetyl Hapten, NIP, Hapten, NIP Acetyl, NIP Hapten