16β-Methyl-3,20-dioxopregna-1,4,9(11)-triene-17,21-diyl dipropanoate; 2-Oxo-2-((8S,10S,13S,14S,16S,17R)-10,13,16-trimethyl-3-oxo-17-(propionyloxy)-6,7,8,10,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthren-17-yl)ethyl propionate;Beclometasone Dipropionate Impurity I;