3,6-dihydroxy-phthalic acid diethyl ester
ethyl (3R),(5S),(6E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl]-3,5-dihydroxy-6-heptenoate
ethyl 3-oxo-4-(thiophen-2-yl)butanoate
4-(4-nitro-phenyl)-3-oxo-butyric acid ethyl ester
ethyl 3-oxo-4-(o-tolyl)butanoate