Two new polyines showing good cytotoxic activity against L1210 cells were isolated from Korean ginseng root. These were 3-acetyloxy-9,10-epoxy-heptadec-1-en-4,6-diyne(acet ylpanaxydol, ED50 = 0.52 microgram/ml) and 10-chloro-3,9-dihydroxyheptadec-1-en-4,6-diyne(Panaxydolc hlorohydrin, ED50 = 0.50