Jh. Sheu et al., STUDY ON CYTOTOXIC OXYGENATED DESMOSTEROLS ISOLATED FROM THE RED ALGAGALAXAURA-MARGINATA, Journal of natural products, 60(9), 1997, pp. 900-903
Four novel oxygenated desmosterols, 24 xi-hydroperoxy-6 beta-hydroxych
olesta-4,25-dien-3-one (1), 25-hydroperoxy-6 beta-hydroxycholesta-4,23
(E)-dien-3-one (2), 24 xi-hydroperoxycholesta-4,25-diene-3,6-dione (3)
, and 25-hydroperoxycholesta-4,23(E)-diene-3,6-dione (4) were isolated
from the marine red alga Galaxaura marginata. Steroids 1-4 and three
synthetic oxygenated desmosterols 5-7 were shown to exhibit significan
t cytotoxicity against several cancer cell lines.