Twelve monoterpene indole glycoalkaloids, comprising of three new ones, 19--rhynchophylloside A (), 7--rhynchophylloside A (), and 7--anthocephalusine A (), were isolated from the hook-bearing branches of . The structures and absolute configurations of were elucidated by analysis of MS, NMR, ECD, and single-crystal X-ray diffraction or TDDFT-ECD calculations. Glycoalkaloids and showed significant immunosuppressive activity against the proliferation of B lymphocyte induced by LPS with broad selective index.
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