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The phosphate salt of codeine occurs as white, needle-shaped crystals or white crystalline powder. Codeine phosphate is freely soluble in water and marginally soluble in Liquor. The molecular pounds is 406.37. Its molecular formulation is C18H21NO3•H3PO4 • ½ H2O, and it has the next chemical framework.Promethazine can be an H1 receptor blockin