Beclometasone (Beclomethasone) Dipropionate EP Impurity M Catalogue L326523 CAS N/A M.W 521.05 M.F C28H37ClO7 Specifications FAQs 9-chloro-11ß-hydroxy-16ß-methyl-3,20-dioxopregna-4,6diene-17,21-diyldipropanoate