You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[6-(butan-2-ylamino)-2-methylpyrimidin-4-yl]-(3,4-dihydro-1H-isoquinolin-2-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N4O
assistant