title: Structure of 6 alpha-methylprogesteron-17 alpha-yl pivalate.
abstract: C27H40O4, Mr = 428.6, orthorhombic, P2(1)2(1)2(1), a = 9.821(3), b = 25.766(6), c = 9.802(3) A, V = 2480(2) A3, Z = 4, Dx = 1.15 g cm-3, lambda(Mo K alpha) = 0.71073 A, mu = 0.70 cm-1, F(000) = 936, T = 295 K, final R = 0.063 for 2778 observed reflections. The A ring assumes a normal 1 alpha,2 beta-half-chair conformation. The progesterone side chain has a conformation typical of 17 alpha-ester steroids; the C(16)-C(17)-C(20)-O(20) torsion angle is -17.9(5) degrees.
authors.affiliation: Technical University of Lodz, Institute of Physics, Poland.
authors.forename: Z
authors.initials: Z
authors.lastname: Wawrzak
authors.forename: P
authors.initials: P
authors.lastname: Grochulski
authors.forename: Z
authors.initials: Z
authors.lastname: Gałdecki
authors.forename: W L
authors.initials: WL
authors.lastname: Duax
authors.forename: P D
authors.initials: PD
authors.lastname: Strong
authors.forename: D N
authors.initials: DN
authors.lastname: Kirk
mesh_terms: D015394:Molecular Structure; D011374:Progesterone / Q000031:analogs & derivatives* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D011374:Progesterone; C068782:6-methylprogesteron-17-pivalate