You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[4-(dimethylamino)anilino]-6,7-dimethoxyquinolin-2-yl]-(4-methylpiperidin-1-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H32N4O3
assistant