Methylene Blue Trihydrate is a competitive inhibitor of glutathione reductase used in combination with antimalarial drugs.||Synonyms:|C.I. Basic Blue 9 Trihydrate; 3,7-Bis(dimethylamino)phenothiazin-5-ium ChlorideTrihydrate; 3,7-Bis(dimethylamino)phenazathionium Chloride Trihydrate; Methylene Blue Trihydrate||CAS No:|7220-79-3||Molecular Formula:|C₁₆H₂₄ClN₃O₃S||Molecular Weight:|373.9||Purity:|98-103% (Assay by titration)||Appearance:|Dark green or blue crystalline powder||Solubility:|Clear blue solution||Copper (Cu):|≤0.02%||Zinc (Zn):|≤0.01%||Arsenic (As):|≤0.0008%||Loss on Drying (@110ºC):|8-18%||Residual Solvents:|To pass test||Residue On Ignition:|≤1.2%||Related Substances:|Azure B: ≤2.5%|Unspecified Impurity: ≤0.1%|Total Impurities: ≤0.5%||Identification:|To pass test||Storage and Stability:|Maybe stored at RT. Stable for 12 months after receipt.