[(S)-1-((S)-3-Benzyl-1,4-dioxo-hexahydro-pyrrolo[1,2-a]pyrazine-2-carbonyl)-2-methyl-propyl]-carbamic acid benzyl ester

(6aR,9R,10aR)-7-Methyl-4,6,6a,7,8,9,10,10a-octahydro-indolo[4,3-fg]quinoline-9-carboxylic acid [(S)-1-((S)-3-benzyl-1,4-dioxo-hexahydro-pyrrolo[1,2-a]pyrazine-2-carbonyl)-2-methyl-propyl]-amide; compound with (Z)-but-2-enedioic acid

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