Synonyms: Basic Red 1 CAS: 989-38-8 Molecular Formula: C28H31N2O3Cl Molecular Weight: 479.01 g/mol Test Specification Description Maroon to red-brown crystalline powder Assay 97 - 103% Solubility (1% in H2O) Opaque, very dark red solution Loss on drying at 110°C / 1 hour 10% max.