Beclometasone (Beclomethasone) Dipropionate EP Impurity E Catalogue L326515 CAS 887130-68-9 M.W 555.49 M.F C28H36Cl2O7 Specifications FAQs trimethyl-3-oxo-17-(2-(propionyloxy)acetyl)-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl propionate