Elatenyne (3,7-dibromo-6-ethyl-2-(pent-2'-en-4'-ynyl ) octahydropyrano [3,2-b] pyran ) was isolated as an oil from the marine red alga Laurencia elata. Its structure and those of three derivatives were assigned on the basis of spectroscopic, predominantly n.m.r ., data.
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Hall et al. (1986) studied this question.