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.

Diverse neolignans and lignans from an aqueous extract of the root head.

Neolignans and lignans with diverse new chemical structures, including eleven pairs of separated chiral enantiomers [(+)-/(-)--(+)-/(-)-, (+)-/(-)-, (+)-/(-)-, and (+)-/(-)--(+)-/(-)-], two achiral compounds ( and ), and an unseparated racemate [(±)-], together with a new natural product () and 21 known derivatives, were isolated from an aqueous extract of the root head (guitou). Among the chiral isolates, (+)-/(-)- and (+)-/(-)- were scalemic pairs with enantiomeric ratios of around 3:1 and 1.5:1, respectively, while others were enantiomeric equivalent pairs.

Sulfonated alkaloids from an aqueous extract of roots.

Eleven new sulfonated alkaloids () having diverse structures were isolated from an aqueous extract of the Isatis indigotica root (ban lan gen). Their structures were determined by spectroscopic data analysis, chemical method, and theoretical calculation, of which (-)- was proved by single crystal X-ray diffraction.

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

Seven new minor monoterpene derivatives (), together with six known analogues, were isolated from an aqueous decoction of the hook-bearing stems of (Gou-teng). Their structures were determined by spectroscopic data analysis and electronic circular dichroism (ECD) calculations, of which was confirmed by single crystal X-ray diffraction.