The alkaloid papaverrubine C has been isolated from opium and Papaver Caucasicum Marsch.-Bieb. and shown to be identical with a stereoisomer of porphyroxine formed from the latter by acid catalysis. It is possibly an artefact formed during extraction. Alkaloids related to porphyroxine have also been isomerised under the same conditions.
D. W. Hughes, L. Kühn and S. Pfeifer, J. Chem. Soc. C, 1967, 444 DOI: 10.1039/J39670000444
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