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.
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