Abstract
Synthesis of both enantiomers of a novel sesquiterpene, isolated as the putative sex pheromone of a Brazilian predatory stink bug (Tynacantha matginata Dallas) and proposed to have an unprecedented tricyclic carbon framework, was accomplished through an intramolecular Diels - Alder cyclization of a single optically active triene intermediate and separation of a pair of structural isomers derived from the resulting cycloadducts.

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