Four new indole alkaloids, trigonoliimines D-G (1-4, resp.), were isolated from Trigonostemon lii. Their structures were elucidated by spectroscopic methods, including extensive 1D- and 2D-NMR experiments.
Chinese National Natural Science Foundation [30830114, 31100259, 30800092, 31360084]
; Young Academic and Technical Leader Raising Foundation of Yunnan Province [2009CI072]
; Natural Science Foundation of Guizhou Province