Ent-untenospongin A, a New C21 Furanoterpene from the Indian Marine Sponge Hippospongia sp

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A new C21 furanoterpene, ent-untenospongin A (2), together with a known related compound, tetradehydrofurospongin-1 (1), has been isolated from the Indian marine sponge Hippospongia sp. And its structure was determined on the basis of spectroscopic data.
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