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Appearance    White crystals or crystalline powder
Assay    99.0 - 100.5%
Specific Rotation    -0.10 o --- +0.10 o
Residue on ignition    0.10% max
Water-insoluble substance    0.1% max
Fumaric Acid    1.0% max
Maleic Acid    0.05% max
Heavy metals(as Pb)    10 ppm max
Arsenic(As)    4 ppm max