2-Amino-4-nitrophenol CAS 99-57-o High Purity Aromatic Intermediate for Dye Manufacturing 2-Amino-4-nitrophenol (CAS 99-57-o) is a functional aromatic nitro compound with amino and hydroxyl substituents on the benzene ring. This fine chemical intermediate features stable molecular structure and good reaction activity, supporting diazotization and coupling reactions in synthetic processes. It serves as a core building block in colorant formulation and organic derivation,