CRYSTAL AND MOLECULAR STRUCTURE OF STEMOTININE

摘要

＜正＞ C18H25NO5, Mr = 335.40, tetragonal, P41212, a = 15.578（4）, c =14.723（3） A, V =3573（2） A3, Z = 8, D = 1.247 g cm-3, MoKα,λ= 0.71069 A, μ = 0.;85 cm-1, T = 293K, final R .= 0.100 and RW （on F2） = 0.080 for 1095 observed data [|FO| ＞ 2σ（|FO|）]. The structure confirms the spectrbscopic assignment of a pentacyclic skeleton containing two α-methyl-γ-lactone rings, one ether and one tertiary amine.