A new source for 2S*,11S*,12R*-isosarcophytoxide (1), along with six known metabolites; 7R,8S-dihydroxydeepoxy-ent-sarcophine (2), sarcophytolol (3), sarcotrocheliol acetate (4), ent-sarcophine (5), guaiacophine (6) and gorgosten-5(E)-3β-ol (7), was identified as Sarcophyton glaucum. The chemical structures were determined based on spectroscopic measurements (NMR, UV, IR and MS). The total extract and isolated compounds were evaluated against four cancer cell lines; HCT116 (human colorectal cancer), HT29 (human colon cancer), CACO-2 (colonic adenocarcinoma) and HepG-2 (human hepatocarcinoma). All tested compounds exhibited cytotoxicity against two cancer cell lines with IC50 in range 8.9–500 µmol/L. Compounds (3) and (4) had significant cytotoxic effects towards HCT116, IC50 = 8.9 ± 0.092 µmol/L and 17.5 ± 0.0.067 µmol/L, respectively and against HepG-2, IC50 20.0 ± 0.032 µmol/L and 19.9 ± 0.062 µmol/L, respectively. 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