N-{4-[({3-[(4S)-6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl]phenyl}dioxo-λ6-sulfanyl)amino]butyl}-1-({19-[({3-[(4S)-6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl]phenyl}dioxo-λ6-sulfanyl)amino]-10-oxo-9,11-diaza-3,6,14,17-tetraoxanonadec-1-yl}amino)methanamide