Molecular formula: C4H4N2O2 Molecular weight: 112.09 CAS No.: 66-22-8 Structure Formula: Description: White or almost white crystalline powder Loss on drying: ≤1.0% Melting point: >300°C Residue on ignition: ≤0.2% Heavy metals: ≤20ppm Assay(HPLC): ≥98.0% Packing: 25kg/barrel Storage: Keep dry, stable at room temperature