10-hydroxy-11-methylenetricyclo<5.3.1.01,6>undecane-6-carboxylic acid lactone

2-hydroxy-11-methylenetricyclo<5.4.0.01,5>undecane-7-carboxylic acid lactone

methyl 2-<(S)-N-<(R)-α-(hydroxymethyl)benzyl>pyrrolidin-2-yl>propenoate

6-hydroxy-2-(penta-3,4-dien-1-yl)-2H-pyran-3(6H)-one

methyl 2-<(S)-N-<(R)-α-(methoxycarbamoyl)benzyl>pyrrolidin-2-yl>propenoate