1-({1-[({3-[(4S)-6-[({26-[({3-[(4S)-6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl]phenyl}dioxo-λ6-sulfanyl)amino]-10,17-dioxo-9,11,16,18-tetraza-3,6,21,24-tetraoxahexacos-1-yl}amino)dioxo-λ6-sulfanyl]-8-chloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl]phenyl}dioxo-λ6-sulfanyl)amino]-10-oxo-9,11-diaza-3,6-dioxapentadec-15-yl}amino)-N-{8-[({3-[(4S)-6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl]phenyl}dioxo-λ6-sulfanyl)amino]-3,6-dioxaoct-1-yl}methanamide