3-{[3-(1,3-Dimethylpent-1-enyl)(2S,3S,8S,6R)-4,6,8-trimethylbicyclo[4.4.0]dec-4-en-2-yl]carbonyl}-5-[(4-hydroxyphenyl)methylene]-3-pyrrolin-2-one AIDS-097033 AIDS097033 Talaroconvolutin A Tetramic acid derivative