A new erythrinan N-oxide alkaloid from Erythrina stricta.

This phytochemical study of stems and leaves of Erythrina stricta led to the isolation of twenty-three alkaloids, one of them previously unreported, 11β-hydroxyerythratidine N-oxide. Their structures were elucidated on the basis of extensive 1D and 2D NMR spectroscopic analyses including HSQC, HMBC, 1H-1H COSY, NOESY, as well as HRESIMS data in addition to comparison with reports in the literature.