2-Amino-5-nitrophenol CAS 121-88-O Reactive Aromatic Crystal Intermediate for Colorant Preparation 2-Amino-5-nitrophenol (CAS 121-88-O) is a nitro-substituted aromatic compound equipped with hydroxyl and amino functional groups. The molecular structure brings favorable reactivity for diazotization and coupling reactions. Widely adopted as a foundational building block in colorant manufacturing and organic derivation. It adapts steadily to laboratory research and continuous