1-({1-[({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-dioxapentadec-15-yl}amino)-N-{8-[({4-butyl-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