The phosphate salt of codeine occurs as white, needle-shaped crystals or white crystalline powder. Codeine phosphate is freely soluble in water and a little soluble in Liquor. The molecular pounds is 406.37. Its molecular components is C18H21NO3•H3PO4 • ½ H2O, and it's the subsequent chemical structure.Promethazine with Codeine Oral Alternativ