You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(Z)-3-[amino(propan-2-yl)amino]prop-2-enyl]-4-[5-butan-2-yl-4-(3,3-dimethylpiperazin-1-yl)pyrido[3,4-d]pyrimidin-2-yl]-3,4-dihydropyridin-6-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H43N9
assistant