A novel compound, named salviskinone A (1), was isolated from Salvia przewarskii. The compound has a rearranged carbon skeleton with a methyl unit at C-5 from abietane-type diterpene. Its structure and relative stereochemistry were elucidated by detailed spectroscopic analysis, including HREIMS and 2DNMR (COSY, HSQC, HMBC, and NOESY) spectra.

A new Erythrinan alkaloid (1), erythodine N-oxide, was isolated from the seeds of Erythrina velutina together with seven known Erythrinan alkaloids (2–7, 9) and an indole alkaloid (8). The structure of new compound (1) was elucidated by spectroscopic methods. Six of the nine compounds showed enhanced activity when combined with tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). Erysotrine (4) did not show cytotoxic activity by itself, but exhibited significant cytotoxicity when combined with TRAIL.A new Erythrinan alkaloid (1), erythodine N-oxide, was isolated from the seeds of Erythrina velutina together with seven known Erythrinan alkaloids (2–7, 9) and an indole alkaloid (8). The new compound (1) was elucidated by spectroscopic methods. Erysotrine (4) did not show cytotoxic activity by itself, but exhibited significant cytotoxicity when combined with TRAIL.

Three new Securinega alkaloids, secu’amamines B−D (1–3), were isolated from the wood of the Japanese medicinal plant Securinega suffruticosa var. amamiensis, together with five known analogues (4, 6–9). The structures 1−3 were elucidated by spectroscopic methods including 2D NMR, and all eight compounds were evaluated for cytotoxicity against two cancer cell lines.