title: Ergometrinine.
abstract: The absolute configuration of ergometrinine, C(19)H(23)N(3)O(2) {systematic name: (6aR,9S)-N-[(S)-1-hy-droxy-propan-2-yl]-7-methyl-4,6,6a,7,8,9-hexa-hydro-indolo[4,3-fg]quinoline-9-carb-ox-amide}, was established based on epimerization reaction of ergometrine, which was followed by preparative HPLC. The non-aromatic ring (ring C of the ergoline skeleton) directly fused to the aromatic rings is nearly planar [maximum deviation = 0.271 (3) Å] and shows an envelope conformation, whereas ring D, involved in an intra-molecular N-H⋯N hydrogen bond, exibits a slightly distorted chair conformation. The structure displays undulating layers in the ac plane formed by O-H⋯O and N-H⋯O hydrogen bonds.
authors: BAM Federal Institute for Materials Research and Testing, Department Analytical Chemistry, Reference Materials, Richard-Willstätter-Strasse 11, D-12489 Berlin-Adlershof, Germany.
authors: Stefan
authors: S
authors: Merkel
authors: Robert
authors: R
authors: Köppen
authors: Matthias
authors: M
authors: Koch
authors: Franziska
authors: F
authors: Emmerling
authors: Irene
authors: I
authors: Nehls
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