3-[(9-benzoylamino-6,10-dioxo-octahydro-pyridazino[1,2-a][1,2]diazepine-1-carbonyl)-amino]-N-methoxy-N-methyl-succinamic acid tert-butyl ester
N-methoxy-N-methyl-3-(2-phenoxy-benzenesulfonylamino)-succinamic acid tert-butyl ester
3-benzyloxy-4-[(S)-2-tert-butoxycarbonyl-1-(methoxy-methyl-carbamoyl)-ethylsulfamoyl]-benzoic acid methyl ester
3-[(9-benzoylamino-6,10-dioxo-octahydro-pyridazino[1,2-a][1,2]diazepine-1-carbonyl)-amino]-4-oxo-butyric acid tert-butyl ester