(4S)-4-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-Acetamido-3-carboxypropanoyl]amino]-4-carboxybutanoyl]amino]-4-oxo-4-[2-[(8-sulfonaphthalen-1-yl)amino]ethylamino]butanoyl]amino]-4-carboxybutanoyl]amino]-5-[[(2S)-1-[(2S)-1-[[(2S)-1-[[(2S)-1-amino-6-[[4-[[4-(dimethylamino)phenyl]diazenyl]benzoyl]amino]-1-oxohexan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]oxy-1-oxobutan-2-yl]amino]-5-oxopentanoic acid