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  • 1 Ministry of Health Division of Pharmaceutical Chemistry, National Institute for the Control of Pharmaceutical and Biological Products 100050 Beijing P. R. China
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Thermal behaviour of codeine phosphate and codeine crystallized at the several solvents system was studied by DSC, and then, the kinetic parameters and thermochemical data have been obtained. We have found that codeine phosphate and codeine exist in a number of polymorphic formes which may inflicence the bio-availability.