Minor alkaloids from an aqueous extract of the hook-bearing stem of .

Seven new monoterpene alkaloids (-), along with 16 known analogues, were isolated from an aqueous decoction of the hook-bearing stems of (Gou-teng). Their structures were determined by spectroscopic data analysis, single crystal X-ray diffraction, and electronic circular dichroism (ECD) calculations. Compounds and are stereoisomers belonging to a novel type of pseudoindoxyl monoterpene alkaloids, is the first monoterpene furoindole alkaloid from nature, and - are derivatives of the known monoterpene alkaloids featuring different structures.