e One OH group on phosphoric acid is esterified with the position 21 OH group of dexamethasone, and the hydrogens from the other two phosphoric acid OH groups are replaced to make the disodium salt.
Most organic drugs contain one acid group, usually a carboxylic acid, -COOH, or one basic primary, secondary, or tertiary amino group, NC 1-3, [3,22,27,28,29] that determines the acid-base ...