Leucovorin Calcium Chemical Formula: C20H21CaN7O7, 511.50 CAS No.: 1492-18-8 Standard: EP6/USP30Appearance: White or light yellow, amorphous or crystalline powder Identification: a. IR Absorption b. Specific Optical Rotation c. Calcium pH(2.5% in H2O)6.8 8.0 Heavy metals:not more than 50ppm Water:not more than 17.0% Bacterial Endotoxins Less than 0.3 IU/mg Related substances Total impurities:not more than 2.5% Assay Calcium Folinate 95.0% 105.0%Storage: Preserve in tight containers, protected from light in dry cool place.