2-oxo-pentane-1,1,5-tricarboxylic acid triethyl ester
2-acetyl-3-oxo-heptanedioic acid diethyl ester
8-(4-Methoxy-3-methyl-phenyl)-5-oxo-octansaeure
3-[3,5-dioxo-2-(β-styryl)cyclopent-1-enyl]propanoic acid
trans-3-[3,5-dihydroxy-2-(β-styryl)cyclopent-1-enyl]propanoic acid
3-[3-hydroxy-5-oxo-2-(β-styryl)cyclopent-1-enyl]-propanoic acid
3-<2.5-Dimethyl-6-oxo-cyclohexen-(1)-yl>-propionsaeure-aethylester