2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-6-(1-methyl-5-(5-(1-methylpyrrolidin-3-yl)pyridin-2-ylamino)-6-oxo-1,6-dihydropyridazin-3-yl)benzyl acetate

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