Product Name:1-cyclopropyl-6,7-difluro-1,4-dihydro-8-methoxy-4-oxo-3-quinoline carboxylic acid ethyl ester Cas no.:112811-71-9 Specification: Appearance:yellowish crystalline powder . Singly impurtiy:0.5%max Total impurity:1.0%max Melting point:182-186degree Loss on drying :0.5%max Residue on igniation:0.2%max