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Appearance White to off-white powder Specific Rotation [20/D] (C=4 in CH3OH) +22o to +26o Melting point 187-190℃ Heavy Metals (Pb) Not more than 20 PPM Arsenic (As2O3) Not more than 2 PPM Loss on Drying Not more than 0.50% Residue on Ignition Not more than 0.2% Assay Not less than 98.5%