(6α,11β,16β)-6-Bromo-9-fluoro-11,17-dihydroxy-16-methyl-21-[(1-oxopentyl)oxy]-pregna-1,4-diene-3,20-dione is a by product of the synthesis of Betamethasone 6α-Bromo 17-Valerate (B327110), an impurity of Betamethasone (B327000), which is a glucocorticoid used as an anti-inflammatory agent.