methyl 4-oxo-3,8-diazabicyclo[3.2.1]octane-2-carboxylate

methyl 4-oxo-3-(2-phenylethyl)-2-sulfanyl-3,4-dihydroquinazoline-7-carboxylate

methyl 4-oxo-3-(trifluoromethyl)piperidine-1-carboxylate

methyl 4-oxo-3-azabicyclo[3.1.1]heptane-2-carboxylate

methyl 4-oxo-3-oxa-5-azatricyclo[5.2.1.0,1,5]decane-7-carboxylate

methyl 4-oxo-3-oxa-5-azatricyclo[5.2.2.0,1,5]undecane-7-carboxylate

methyl 4-oxo-3-phenyl-2-sulfanyl-3,4-dihydroquinazoline-7-carboxylate

methyl 4-oxo-3-[(oxolan-2-yl)methyl]-2-sulfanyl-3,4-dihydroquinazoline-7-carboxylate

methyl 4-oxo-3H,4H-pyrido[2,3-d]pyrimidine-6-carboxylate

methyl 4-oxo-3H,4H-pyrido[3,2-d]pyrimidine-6-carboxylate

methyl 4-oxo-3H,4H-pyrrolo[2,1-f][1,2,4]triazine-7-carboxylate

methyl 4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxylate

methyl 4-oxo-4,5,6,7-tetrahydro-1-benzofuran-2-carboxylate

methyl 4-oxo-4-(pyrrolidin-2-yl)butanoate hydrochloride

methyl 4-oxo-4-phenylbutanoate

methyl 4-oxo-4H,5H,6H,7H,8H-pyrazolo[1,5-a]azepine-2-carboxylate

methyl 4-oxo-4H,5H,6H,7H,8H-[1,2,3]triazolo[1,5-a][1,4]diazepine-3-carboxylate

methyl 4-oxo-4H,5H,6H,7H-pyrazolo[1,5-a]pyridine-2-carboxylate

methyl 4-oxo-4H,5H,6H-cyclopenta[b]thiophene-2-carboxylate

methyl 4-oxo-4H,5H-pyrazolo[1,5-a]pyrazine-2-carboxylate

methyl 4-oxo-4H,5H-pyrazolo[1,5-a]pyrazine-7-carboxylate

methyl 4-oxo-4H,5H-thieno[3,2-c]pyridine-7-carboxylate

methyl 4-oxo-4H,5H-thieno[3,2-c]quinoline-2-carboxylate

methyl 4-oxo-4H-chromene-6-carboxylate

methyl 4-oxoadamantane-1-carboxylate

methyl 4-oxocycloheptane-1-carboxylate

methyl 4-oxocyclohexane-1-carboxylate

methyl 4-oxohex-2-ynoate

methyl 4-oxooxane-2-carboxylate

methyl 4-oxooxane-3-carboxylate

methyl 4-oxooxolane-2-carboxylate

methyl 4-oxooxolane-3-carboxylate

methyl 4-oxopentanoate

methyl 4-oxopiperidine-1-carboxylate

methyl 4-oxopiperidine-3-carboxylate hydrochloride

methyl 4-oxospiro[2.4]heptane-5-carboxylate

methyl 4-oxothiane-3-carboxylate

methyl 4-oxothiolane-2-carboxylate

methyl 4-phenoxypyridine-3-carboxylate

methyl 4-phenyl-1H-pyrrole-2-carboxylate

methyl 4-phenyl-1H-pyrrole-3-carboxylate

methyl 4-phenyl-2-azabicyclo[2.1.1]hexane-1-carboxylate hydrochloride

methyl 4-phenyl-4,5-dihydro-1H-pyrazole-3-carboxylate

methyl 4-propanoylbenzoate

methyl 4-propanoyloxane-4-carboxylate