(S)-3-[(Z)-benzylidene]hexahydropyrrolo[1,2-a]pyrazine-1,4-dione

N-(tert-butyloxycarbonyl)-L-phenylalanyl-D-proline methyl ester

5-benzyl-10b-hydroxy-2-methyl-1,8,9,10,10a,10b-hexahydroimidazo<1,2-a>pyrrolo<2,1-c>pyrazine-3,6(2H,5H)-dione

N,N-bis-Boc-L-phenylalanine-1-succinimidyl ester

N-(N-phenylacetyl-Ala)-cyclo-(Phe-Pro)