4-(benzyloxycarbonyl)amino-5-methyl-3-oxohexansaeure-aethylester

(+/-)-Ethyl 5-Methyl-4-phthalimido-3-oxohexanoate

(+/-)-Ethyl (E)-5-Methyl-4-phthalimido-3-oxo-2-hexenoate

phthalyl-DL-valine acid chloride

4-hydroxy-5-isopropyl-1,5-dihydro-pyrrol-2-one