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Three new spiro‐sesquiterpenoids, myrmekiones A−C (1–3), were isolated from the marine sponge Myrmekioderma sp. collected from the South China Sea. The structures of 1–3 were experimentally illuminated though comprehensive NMR spectra, X‐ray diffraction analysis and calculated ECD. These three compounds possessed a special spiro skeleton. Compound 1 was characterized by a chamigrane‐type structure,...
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