CAS NO:22204-53-1 DL-Naproxen Chinese name English name DL-Naproxen DL- naproxen CAS No. 22204-53-1 The molecular formula C14H14O3 with molecular weight of 230 Appearance: white or white solid block Naphthoic acid NMT 0.5% naphthalene ethylene oxime NMT 0.2% Acetonaphthone NMT 0.2% other total impurities NMT 0.5% Melting point 153-158 dry weight loss NMT 0.5% Heavy metal residue on ignition NMT 10ppm NMT 0.3% Content is more than 98.5% Use of pharmaceutical intermediates, intermediates of naproxen. 25KG/ cardboard packaging