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The title compound, C 28 H 34 Cl 2 O 7 , is a derivative of the glucocorticoid steroid beclomethasone dipropionate. It features an expoxide linkage [angle at oxygen = 96.6 (2)°]. The dichlorocyclohexenone ring adopts an envelope conformation, with the C atom bearing the two Cl substituents representing the flap. The dichloro­methyl C atom deviates by 0.471 (4) Å from the plane defined by the other five atoms, whose maximum r.m.s. deviation is 0.04 Å.

acta crystallographica. section e

(8S,9R,10S,11S,13S,14S,16S,17R)-4,4-Dichloro-16β-methyl-3,20-dioxo-17,21-bis(propanoyloxy)-5β,8β-epoxypregna-1,9-diene