9-Chloro-16beta-methyl-3,20-dioxopregna-1,4-diene-11beta,17,21-triyl tripropanoate,(8S,9R,10S,11S,13S,14S,16S,17R)-9-Chloro-10,13,16-trimethyl-3-oxo-17-(2-(propionyloxy)acetyl)-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a] phenanthrene-11,17-diyl Dipropionate,Beclomethasone Impurity