Known as: (1S,9S)-N-((2R,3S)-2-Ethoxy-5-oxotetrahydrofuran-3-yl)-9-((isoquinolin-1-ylcarbonyl)amino)-6,10-dioxooctahydro-6-H-pyridazino(1,2-a)(1,2)diazepine-1-carboxamide, N-((2R,3S)-2-ethoxytetrahydro-5-oxo-3-furanyl)octahydro-9-((1-isoquinolinylcarbonyl)maino)-6,10-dioxo-(1S,9S)-6H-pyridazino(1,2-a)(1,2)diazepine-1-carboxamide