title: 7,11-cyclobotryococca-5,12,26-triene, a novel botryococcene-related hydrocarbon occurring in natural environments
abstract: [formula: see text] With the unambiguous structural characterization of 7,11-cyclobotryococca-5,12,26-triene 1 by NMR, a novel C30 botryococcene-related hydrocarbon skeleton bearing a midchain five-membered ring has been identified in organic-rich sediments from Lake Cadagno (Switzerland). This compound may originate from the green alga Botryococcus braunii (race B) widespread in recent and past environments. Alternatively, it may also be a yet unreported lipid of green sulfur photosynthetic bacteria (Chlorobiaceae) or a microbial transformation product of the farnesol produced by the latter.
authors.affiliation: Laboratoire de Geochimie Organique, UMR 7509 du CNRS, Universite Louis Pasteur, Strasbourg, France.
authors.initials: A
authors.lastname: Behrens
authors.initials: P
authors.lastname: Schaeffer
authors.initials: S
authors.lastname: Bernasconi
authors.initials: P
authors.lastname: Albrecht