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A new degraded sesquiterpene was isolated from the marine actinomycete Streptomyces sp. 0616208. Its structure was elucidated as (1α, 4aα, 5α, 7β, 8aβ)-5, 8a-dimethyl-decahydrona-phthalene-1, 4a, 7-triol on the basis of spectroscopic data.