Molecular formula: C10H12N4O5 Molecular weight: 268.23 CAS No.: 58-63-9 Structure Formula: dentification: White crystals or crystalline powder, odorless; slightly bitter taste. Identification: (1)Show positive reaction. (2)The retention time complies to standard. (3)Infrared absorption Transmittance: ≥98.0% Loss on drying: ≤1.0% Residue on ignition: ≤0.1% Heavy metals: ≤10ppm Related substance: ≤1.0% Assay: ≥98.0% Packing: 20kg/barrel Complies with CP2005 Storage: Keep dry, stable at room temperature.