DL-α-alanyl-DL-norvaline

(3S,5S,6R)-4-(benzyloxycarbonyl)-5,6-diphenyl-3-(2'-propenyl)-2,3,5,6-tetrahydro-4H-1,4-oxazin-2-one

(R)-2-((4S,5R)-2-Oxo-4,5-diphenyl-oxazolidin-3-yl)-pent-4-enoic acid benzyl ester

(3S,6S,8S,8aS)-7,7,8a-trimethyl-3-propyl-3,5,6,7,8,8a-hexahydro-2H-6,8-methanobenzo[b][1,4]oxazin-2-one

α-ketovalerate