title: 6β-Methyl-3,20-dioxopregn-4-en-17-yl acetate.
abstract: The title compound, C(24)H(34)O(4), is a precursor of Megestrol acetate. Ring A has a half-chair conformation [Q = 0.446 (3) Å, θ = 54.6 (4)° and ϕ = 9.5 (4)°]. Ring D adopts a 13β-envelope conformation [Q = 0.463 (2) Å and ϕ = 188.2 (3)°].
authors.affiliation: Qianjiang Colloge, Hangzhou Normal University, Hangzhou 310012,  People's Republic of China.
authors.forename: Longran
authors.initials: L
authors.lastname: Chen
authors.forename: Xuefen
authors.initials: X
authors.lastname: Liu
authors.forename: Peng
authors.initials: P
authors.lastname: Yang