The minor alkaloids of B. arborea have been identified. Three of them have been shown to be dihydro-sanguinarine, oxysanguinarine, and 11-O-methyldihydrochelerythrine respectively. The structure of the fourth has been established by physical methods and by synthesis as the hitherto unknown 1,3-bis(11-hydrochelerythrinyl)acetone. It does not appear to be an artefact. The high resolution mass spectra of some dihydrochelerythrine derivatives are discussed.
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MacLean et al. (1969) studied this question.
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