Provide the molecular formula for the IUPAC named substance N'-[[2-(1,1-difluorobutyl)-4-[[5-(2-imidazo[1,2-b]pyridazin-3-ylethynyl)-6-methylpyridin-3-yl]methylamino]phenyl]methyl]-N,N,N'-trimethylethane-1,2-diamine .