11beta,21-dihydroxy-16alpha,17-(isopropylidenedioxy)pregna-1,4-diene-3,20-dione 21-butyrate

Butyric acid 11β-hydroxy-16α,17-[(1-methylethylidene)bis(oxy)]-3,20-dioxopregna-1,4-dien-21-yl ester