Sesquiterpenes and Other Metabolites from the Marine Red Alga Laurencia composita (Rhodomelaceae)

Two new halogenated sesquiterpenes, (8β)‐10‐bromo‐3‐chloro‐2,7‐epoxychamigr‐9‐en‐8‐ol (1) and 2‐bromo‐3‐chlorobisabola‐7(14),11‐diene‐6,10‐diol (3), and one new phytol‐derived diterpene, 2,3‐epoxyphytyl acetate (4), along with cis‐ and trans‐1‐methylcyclohexane‐1,4‐diol (5 and 6) which were isolated from a natural source for the first time but have been previously synthesized, were isolated from the marine red alga Laurencia composita and characterized. In addition, a known sesquiterpene, pacifenediol (2), and the known furanone derivative 7 were also identified. Their structures were established by NMR and mass spectroscopic methods.