3-[[1-[3-[[(2S)-2-[[(4S)-4-[[2-[4,7-bis(hydroxymethyl)-10-methyl-1,4,7,10-tetrazacyclododec-1-yl]acetyl]amino]-5-[[(2R)-1-[3-[3-[[2-carboxy-2-[(2,4,6-trimethylphenyl)sulfonylamino]ethyl]carbamoyl]-7-[(1H-imidazol-2-ylamino)methyl]-4-oxoquinolin-1-yl]propylamino]-1-oxo-3-sulfopropan-2-yl]amino]-5-oxopentanoyl]amino]butanoyl]amino]propyl]-7-[(1H-imidazol-2-ylamino)methyl]-4-oxoquinoline-3-carbonyl]amino]-2-[(2,4,6-trimethylphenyl)sulfonylamino]propanoic acid