(S)-5-(2-Hydroxy-ethyl)-3,6-dioxo-piperazine-2-carboxylic acid tert-butyl ester

2-Benzyloxycarbonylamino-N-((S)-2-oxo-tetrahydro-furan-3-yl)-malonamic acid tert-butyl ester

2,5-diethoxy-3-L-(2-bromoethyl)-3,6-dihydropyrazine

diethyl L,L-2,5-diaminoadipate dihydrochloride

3,6-diethoxy-2,5-diazabicyclo<2.2.2>octa-2.5-diene