A new indole alkaloid, ginsenine, with a seven-membered lactam unit, was isolated from the berry of Panax ginseng. Its structure was established on the basis of extensive NMR (1H- and 13C-NMR, 1H-1H COSY, DEPT, HMQC, HMBC), IR, and ESI-MS analysis.
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WANG et al. (2006) studied this question.
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