title: Oxachamigrenes, new halogenated sesquiterpenes from Laurencia obtusa.
abstract: Two new sesquiterpenes belonging to a novel oxacyclic structural type of chamigrene skeleton, oxachamigrene (1) and 5-acetoxyoxachamigrene (2), have been isolated from the red alga Laurencia obtusa. The structures of the compounds were determined on the basis of spectroscopic evidence. A biogenetic route for these metabolites has been proposed.
authors.affiliation: Instituto de Productos Naturales y Agrobiología del CSIC, Avenida Astrofísico F. Sánchez 3, Apartado 195, 38206 La Laguna, Tenerife, Spain.
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Brito
authors.forename: Mercedes
authors.initials: M
authors.lastname: Cueto
authors.forename: Ana R
authors.initials: AR
authors.lastname: Díaz-Marrero
authors.forename: José
authors.initials: J
authors.lastname: Darias
authors.forename: Aurelio
authors.initials: A
authors.lastname: San Martín
mesh_terms: D002853:Chromatography, Liquid; D003462:Cuba; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D000461:Rhodophyta / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification*; D013055:Spectrophotometry, Infrared
chemical_list: C465000:5-acetoxyoxachamigrene; D012717:Sesquiterpenes; C464999:oxachamigrene