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Nepenthe-Like Indole Alkaloids with Antimicrobial Activity from Ervatamia chinensis.

Two monoterpenoid indole alkaloid erchinines A (1) and B (2), possessing unique 1,4-diazepine fused with oxazolidine architecture and three hemiaminals, were isolated from Ervatamia chinensis. Their structures were elucidated on the basis of intensive spectroscopic analysis, and a plausible biosynthetic pathway from ibogaine was proposed. Both compounds exhibited significant antimicrobial activity against Trichophyton rubrum and Bacillus subtilis, and their activities were comparable to the first line antifungal drug griseofulvin and antibiotic cefotaxime.