5 Nitro Isophthalic Acid | Chemicals Exporter | India Product 5 Nitro Isophthalic Acid (NIPA) CAS # 618-88-2 Empirical Formula C8H5NO6 Purity 98.00% Min. Appearance Light Cream Crystalline Powder Molecular Weight 211 Melting Point (°C) 260–264