N-[(2S)-5-(diaminomethylideneamino)-1-[4-[(2S,5S)-5-[4-[4-(diaminomethylideneamino)butanoylamino]butyl]-3,6-dioxopiperazin-2-yl]butylamino]-1-oxopentan-2-yl]benzamide
N-[(1S)-4-guanidino-1-[4-[(2S,5S)-5-[4-(4-guanidinobutanoylamino)butyl]-3,6-dioxo-piperazin-2-yl]butylcarbamoyl]butyl]benzamide
N-[(1S)-4-guanidino-1-[[4-[(2S,5S)-5-[4-[(4-guanidino-1-oxobutyl)amino]butyl]-3,6-dioxo-2-piperazinyl]butylamino]-oxomethyl]butyl]benzamide
N-[(1S)-4-guanidino-1-[4-[(2S,5S)-5-[4-(4-guanidinobutanoylamino)butyl]-3,6-diketo-piperazin-2-yl]butylcarbamoyl]butyl]benzamide
N-[(2S)-5-(diaminomethylideneamino)-1-[4-[(2S,5S)-5-[4-[4-(diaminomethylideneamino)butanoylamino]butyl]-3,6-dioxo-piperazin-2-yl]butylamino]-1-oxo-pentan-2-yl]benzamide