Entecavir CAS NO: 142217-69-4 Description white to off- white powder Optical Rotation +32.5--+36.0 Melting Point 230-24 C Sulfate NMT0.05% Chloride NMT0.02% Heavy Metal NMT 20ppm Losson on drying NMT 0.5% Residue on Ignition NMT 0.1% Assay NLT 99.0% Conclusion: It Conforms to prescribed enterprise standard