Three new sesquiterpenoids, boneratamides A (1)-C (3), have been isolated as their methyl esters 4-6 from extracts of the marine sponge Axinyssa aplysinoides collected in Indonesia. The structures of methyl esters 4-6 were elucidated by analysis of spectroscopic data and confirmed by single-crystal X-ray diffraction analysis of 4.
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Williams et al. (2004) studied this question.
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