title: Methyl 3β-methoxy-carbon-yloxy-4,4-di-methyl-17-oxo-16α-(3-oxobut-yl)-16β-carboxylate.
abstract: The title steroid, C(29)H(44)O(7), is a new androgen derivative and a key inter-mediate 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.
authors.forename: Xin
authors.initials: X
authors.lastname: Yan
authors.forename: Shiqing
authors.initials: S
authors.lastname: Xu
authors.forename: Jingmei
authors.initials: J
authors.lastname: Wang
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
authors.forename: Peng
authors.initials: P
authors.lastname: Xia