methyl L-cysteinyl-L-prolyl-L-phenylalaninate

N-(9,10-Dihydrolysergyl-O-benzyl-L-seryl)-L-phenylalanyl-L-prolin-lactam

(L-Valyl)-L-phenylalanyl-L-prolin-lactam

3-benzylhexahydropyrrolo[1,2-a]pyrazine-1,4-dione