CAS: 185613-71-2

Betamethasone EP impurity H is an impurity in betamethasone, which is a corticosteroid. It has been used as an analytical reference standard for HPLC, and is also used as a pharmacopoeia or custom synthesis impurity standard. Betamethasone EP impurity H can be synthesized from betamethasone by utilizing the hydrolysis of the ester linkage between the methyl group and the 17-alpha hydroxyl group.