The major alkaloid isolated from the aerial parts of a sample of P. rhoeas proved to be (+)-rhoeadine. The minor alkaloids were allocryptopine, protopine, coulteropine, berberine, coptisine, sinactine, (+)-isocorydine, (+)-roemerine, and (+)-rhoeagenine
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Kalav et al. (1989) studied this question.
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