(1S,9S)-t-butyl 1,2,3,4,7,8,9,10-octahydro-6,10-dioxo-9-phthalimidopyridazino<1,2-a><1,2>diazepine-1-carboxylate
(1S,9S)-t-butyl 9-<(1S)-ethoxycarbonyl-3-phenylpropylamino>octahydro-6,10-dioxo-6H-pyridazino<1,2-a><1,2>diazepine-1-carboxylate
(1S,9S)-t-butyl 9-<(1R)-ethoxycarbonyl-3-phenylpropylamino>octahydro-6,10-dioxo-6H-pyridazino<1,2-a><1,2>diazepine-1-carboxylate
(1S,9S)-t-butyl octahydro-10-oxo-9-phthalimido-6H-pyridazino<1,2-a><1,2>diazepine-1-carboxylate
(1S,9S)-t-butyl 9-<(1S)-ethoxycarbonyl-3-phenylpropylamino>octahydro-10-oxo-6H-pyridazino<1,2-a><1,2>diazepine-1-carboxylate