Quinidine Sulfate dihydrate 1G. Quinidine Sulfate dihydrate, CAS Number: 6591-63-5, Molecular Formula: (C20H24N2O2)2. H2SO4. 2H2O, Molecular Weight: 782. 9, Purity: greater than or equal to 97% by HPLC, Appearance: White to off-white powder, Synonym: Conquinine B-Quinine, Size: 1G