Appearance: White or offer white crystalline powder Assay: 98.0%～102.0% Identification: 1) IR Absorption - As per reference standard 2) UV Absorption - Do not differ by more than 3% at 272nm Loss on drying: 1.0% max. Specific rotation: -15.3° ～-17.0° Heavy metals: 0.002% max. Free naproxen: 1.0% max. Residual Solvent Acetone: 0.5% max. Chromatographic purity 1)Any single impurity: 0.5%max. 2)Total impurities: 2.0% max. Packing: 25kg/ fibre drum Storage: kept at cool, shadow place Shelf life: 3 years under proper storage

CAS NO:22204-53-1

EC NO:244-838-7

Molecular Formula:C₁₄H₁₃O₃

Molecular Weight:229.2518

Synonyms:;(S)-(+)-2-(6-Methoxy-2-naphthyl)propionic acid;(+)-6-Methoxy-alpha-methyl-2-naphthaleneacetic acid;Naproxen;(2S)-2-(6-methoxynaphthalen-2-yl)propanoic acid;(2S)-2-(6-methoxynaphthalen-2-yl)propanoate;

Molecular Structure: