Abstract
A new sesquiterpenoid quinone, metachromin C[1], with potent cytotoxic activity has been isolated together with a known terpenoid metachromin A[2] from the Okinawan marine sponge Hippospongia metachromia and the structure determined by spectroscopic data, especially several types of 2D nmr spectra including 1H-detected heteronuclear multiple-bone correlation (HMBC).
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