(+)-Raspailyne-A, a novel, acid-sensitive acetylenic enol ether glyceride from the marine sponge Raspailia pumila
Abstract
Homonuclear 1H n.m.r. spin decouplings and proton shift-correlated 2D (COSY) n.m.r. spectra, together with selective heteronuclear spin decouplings of 13C n.m.r. spectra and mass spectra, suggest for the title compound the acetylenic enol ether glyceride structure (+)-(1a), or its enantiomer.