p-nitro acetoacetanilide, 4'-Nitroacetoacetanilide, N-(4-Nitrophenyl)-3-oxobutyramide, N-para-nitrophenylacetoacetamide, N-(4-nitrophenyl)acetoacetamide, Acetoacet-p-nitroanilide(AAPNA), n-(4-nitro-phenyl)-3-oxo-butyramide, N-(4-nitrophenyl)-2-acetylacetamide