methyl {[6-amino-4-({[(6-amino-2-{5-fluoro-1-[(2-fluorophenyl)methyl]pyrazolo[3,4-b]pyridin-3-yl}-5-[(methoxycarbonyl)amino]pyrimidin-4-yl)amino]methyl}amino)-2-{5-fluoro-1-[(2-fluorophenyl)methyl]pyrazolo[3,4-b]pyridin-3-yl}pyrimidin-5-yl]amino}methanoate