Acanthiline A, a pyrido[1,2-a]indole alkaloid from Chinese mangrove Acanthus ilicifolius.

Chemical investigation of the leaves and stems of the Chinese mangrove Acanthus ilicifolius Linn. led to the isolation and structure elucidation of one new pyrido[1,2-a]indole alkaloid named acanthiline A (1), together with one known compound aurantiamide acetate (2). Compound 1 has a previously unreported natural product skeleton. The structure elucidation of 1 was based on the analysis of its 1D and 2D NMR and mass spectroscopic data.