10.1021/ol303211w.s001 Evangelos C. Tatsis Evangelos C. Tatsis Anu Schaumlöffel Anu Schaumlöffel Anne C. Warskulat Anne C. Warskulat Georges Massiot Georges Massiot Bernd Schneider Bernd Schneider Gerhard Bringmann Gerhard Bringmann Nudicaulins, Yellow Flower Pigments of <i>Papaver nudicaule</i>: Revised Constitution and Assignment of Absolute Configuration American Chemical Society 2013 interpretation calculation Nudicaulin pentacyclic indole alkaloid Papaver nudicaule Revised Constitution Yellow Flower Pigments ECD spectra Assignment nudicaulin diastereomer II analyses configuration Absolute ConfigurationThe constitution NMR aglycon 2013-01-04 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Nudicaulins_Yellow_Flower_Pigments_of_i_Papaver_nudicaule_i_Revised_Constitution_and_Assignment_of_Absolute_Configuration/2455564 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 (<b>3a</b>) and II (<b>3b</b>), have been assigned by NMR, conformational analyses, and interpretation of the experimental ECD spectra by quantum-chemical calculations.