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The title steroid, C 29 H 44 O 7 , is a new androgen derivative and a key inter­mediate for synthesizing novel anti-HIV steroid agents. There are four  trans -fused rings in the structure. The three six-membered rings exhibit chair conformations, while the five-membered ring adopts an envelope conformation.

Methyl 3β-methoxycarbonyloxy-4,4-dimethyl-17-oxo-16α-(3-oxobutyl)-16β-carboxylate