C. kyselina (3S)-2-[(3S,8aS)-3-(4-aminobutyl)-1,2,3,4,6,7,8,8a-oktahydro-1,4-dioxopyrrolo[1,2-a]- piperazin-2-yl]-4-fenylbutanová (S,S,S-diketopiperazin),
C. kyselina (3S)-2-[(3S,8aS)-3-(4-aminobutyl)-1,2,3,4,6,7,8,8a-oktahydro-1,4-dioxopyrrolo[1,2-a]- piperazin-2-yl]-4-fenylbutanová (S,S,S-diketopiperazin),