(R)-tert-Butyl 3-oxotetrahydro-1H-oxazolo[3,4-a]pyrazine-7(3H)-carboxylate
6-Hydroxy-2-oxotetrahydro-2H-3,5-methanocyclopenta[b]furan-3(3aH)-carbonitrile
Ethyl 4-oxotetrahydro-2H-pyran-2-carboxylate
(S)-tert-Butyl 3-oxotetrahydro-1H-oxazolo[3,4-a]pyrazine-7(3H)-carboxylate
Ethyl 4-oxotetrahydro-2H-thiopyran-3-carboxylate
Ethyl 4-oxotetrahydro-2H-pyran-3-carboxylate(mixture of isomers)
Methyl 4-oxotetrahydro-2H-thiopyran-3-carboxylate
Methyl 3-oxotetrahydro-2H-pyran-4-carboxylate
Ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate
Methyl 4-oxotetrahydro-2H-pyran-3-carboxylate
Ethyl 5-oxotetrahydro-2H-pyran-2-carboxylate
