Appearance: white or off white crystalline powder Molecular formula: c14h11f3n2o2c7h17no5 Molecular weight: 491.46 Standard : usp29 Assay 99.0% Melting range: 137½140ñ Specific rotation: -9.5¬--12.0 Residue on ignition0.5% Cas: 42461-84-7 Package: 25kg/drum Valid : 3 years 25kg/drum