Sesquiterpene content of the antibacterial dichloromethane extract of the marine red alga Laurencia obtusa.

For a sample of Laurencia obtusa, collected from the Caribbean island of Dominica, allolaurinterol was isolated for the first time and found to be responsible for the biological activity of the dichloromethane extract. For allolaurinterol, complete and assigned 1H- and 13C-NMR data are given, together with an assessment of its antibacterial, antifungal, and antialgal activities.