1967 年 87 巻 6 号 p. 631-639
Among the series of alkaloids isolated from Pachysandra terminalis SIEB. et ZUCC. (Japanese name "Fukki-so"), mass spectra were measured of the structurally established 5α-pregnane type alkaloids, especially steroid alkaloids with oxygen function in the 4-position, and their derivatives, and their fragmentation mechanism was examined.