(S)-2,6-Dioxo-1-pentyl-hexahydro-pyrimidine-4-carboxylic acid benzyl ester
(S)-1-Isopropyl-2,6-dioxo-hexahydro-pyrimidine-4-carboxylic acid benzyl ester
(S)-1-(2-Methoxy-ethoxymethyl)-2,6-dioxo-hexahydro-pyrimidine-4-carboxylic acid; compound with dicyclohexyl-amine
(4S)-1-methyl-2,6-dioxo-1,3-diazinane-4-carboxylic acid
(S)-1-Benzyl-2,6-dioxo-hexahydro-pyrimidine-4-carboxylic acid