6-(6-Nitro-pyridin-3-yl)-2,6-diaza-spiro[3.3]heptane-2-carboxylic acid tert-butyl ester

6-tert-butyl-2-(3-{5-[5-(2,6-diaza-spiro[3.3]hept-2-yl)-pyridin-2-ylamino]-1-methyl-6-oxo-1,6-dihydro-pyridazin-3-yl}-2-hydroxymethyl-phenyl)-8-fluoro-2H-phthalazin-1-one

6-(6-aminopyridin-3-yl)-2,6-diazaspiro[3.3]heptane-2-carboxylic acid test-butyl ester

6-(6-{6-[3-(6-tert-butyl-8-fluoro-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-2-methyl-3-oxo-2,3-dihydropyridazin-4-ylamino}-pyridin-3-yl)-2,6-diaza-spiro[3.3]heptane-2-carboxylic acid tert butyl ester

6-(6-{6-[2-acetoxymethyl-3-(6-tert-butyl-8-fluoro-1-oxo-1H-phthalazin-2-yl)phenyl]-2-methyl-3-oxo-2,3-dihydropyridazin-4-ylamino}pyridin-3-yl)-2,6-diazaspiro[3.3]heptane-2-carboxylic acid tert butyl ester

6-tert-butyl-8-fluoro-2-(2-hydroxymethyl-3-{1-methyl-5-[5-(6-methyl-2,6-diaza-spiro[3.3]hept-2-yl)-pyridin-2-ylamino]-6-oxo-1,6-dihydro-pyridazin-3-yl}-phenyl)-2H-phthalazin-1-one

6-[6-(6-Chloro-2-methyl-3-oxo-2,3-dihydro-pyridazin-4-ylamino)-pyridin-3-yl]-2,6-diaza-spiro[3.3]heptane-2-carboxylic acid tert-butyl ester