title: Carboline alkaloids from Trigonostemon lii.
abstract: Three types with six new carboline alkaloids, trigonostemonines A-F (1- 6), were isolated from the roots and stems of Trigonostemon lii. Their structures were elucidated by spectroscopic analyses. It is the first time that beta-carboline alkaloids have been reported in Trigonostemon species. Trigonostemonine F (6) exhibited moderate cytotoxic activity against HL-60 with an IC (50) value of 16 microM.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, P. R. China.
authors.forename: Xu-Jia
authors.initials: XJ
authors.lastname: Hu
authors.forename: Ying-Tong
authors.initials: YT
authors.lastname: Di
authors.forename: Yue-Hu
authors.initials: YH
authors.lastname: Wang
authors.forename: Ling-Yi
authors.initials: LY
authors.lastname: Kong
authors.forename: Suo
authors.initials: S
authors.lastname: Gao
authors.forename: Chun-Shun
authors.initials: CS
authors.lastname: Li
authors.forename: Hai-Yang
authors.initials: HY
authors.lastname: Liu
authors.forename: Hong-Ping
authors.initials: HP
authors.lastname: He
authors.forename: Jian
authors.initials: J
authors.lastname: Ding
authors.forename: Hua
authors.initials: H
authors.lastname: Xie
authors.forename: Xiao-Jiang
authors.initials: XJ
authors.lastname: Hao