Product: Entecavir Molecular formula: C12H15N5O3. H2O Appearance: Almost white or white powder Purity: Not less than 98. 5% complies EE value: Not less than 98. 5% complies Melting point: Not less than 220 complies Specific rotation: +32. 0~ +36. 0 complies Loss on drying: Not more than 0. 5% complies Heavy metals: Not more than 20ppm complies Residue on ignition: Not more than 0. 1% complies