title: 3α,4α-Ep-oxy-5α-androstan-17β-yl acetate.
abstract: The title compound, C(21)H(32)O(3), results from modifications of the A and D rings of the aromatase substrate androstenedione. Ring A adopts a conformation between 10β-sofa and 1α,10β half-chair. Rings B and C are in slightly flattened chair conformations. Ring D approaches a 13β-envelope conformation, probably due to the acet-oxy substituent, and shows a very short Csp(3)-Csp(3) bond next to the epoxide ring, which is characteristic of 3-4 epoxides. .
authors.forename: L C R
authors.initials: LC
authors.lastname: Andrade
authors.forename: J A
authors.initials: JA
authors.lastname: Paixão
authors.forename: M J M
authors.initials: MJ
authors.lastname: de Almeida
authors.forename: F M
authors.initials: FM
authors.lastname: Fernandes Roleira
authors.forename: E J
authors.initials: EJ
authors.lastname: Tavares da Silva