Boneratamides A-C, new sesquiterpenoids isolated from the marine sponge Axinyssa aplysinoides.

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.