Under IUPAC nomenclature, a molecule named 2-(methylamino)-1-[4-[2-[1-methyl-3-[(5-methylpyridin-2-yl)amino]cyclobutyl]oxy-5-(oxolan-3-yl)-2H-pyrazin-1-yl]-3,6-dihydro-2H-pyridin-1-yl]ethanone is given. What is its corresponding molecular formula?