title: Nudicaulins, yellow flower pigments of Papaver nudicaule: revised constitution and assignment of absolute configuration.
abstract: The constitution of the aglycon of nudicaulin has been revised to be a pentacyclic indole alkaloid. The relative and absolute configurations of the two diastereomers, nudicaulins I (3a) and II (3b), have been assigned by NMR, conformational analyses, and interpretation of the experimental ECD spectra by quantum-chemical calculations.
authors.affiliation: Max Planck Institute for Chemical Ecology, Hans-Knöll-Strasse 8, Beutenberg Campus, 07745 Jena, Germany.
authors.forename: Evangelos C
authors.initials: EC
authors.lastname: Tatsis
authors.forename: Anu
authors.initials: A
authors.lastname: Schaumlöffel
authors.forename: Anne C
authors.initials: AC
authors.lastname: Warskulat
authors.forename: Georges
authors.initials: G
authors.lastname: Massiot
authors.forename: Bernd
authors.initials: B
authors.lastname: Schneider
authors.forename: Gerhard
authors.initials: G
authors.lastname: Bringmann
mesh_terms: D035264:Flowers / Q000737:chemistry; D026121:Indole Alkaloids / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010207:Papaver / Q000737:chemistry*; D010860:Pigments, Biological / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D026121:Indole Alkaloids; D010860:Pigments, Biological