Content: not less than 98%. Character: white or light-yellow crystal; scentless, flavourless;easy to changing yellow to meet heat or light. Dissolving in chloroform, appreciably in alcohol and aether,less in water,easy in thin vitriol. Meliting point: 141 í½144 íµ. Specific optical rotation: -290íp to -300íp. Absorption coefficient: 150 í½ 160(ú+1% 1cm). Loss on drying: not more than 5.0 úÑ. Residue on ignition: not more than 0.1 úÑ. Pharmacology function: easing pain; relieving convulsion; relieving cough. 25KG/Barrel.
