You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[6-(2-azaspiro[3.3]heptan-2-yl)-4-fluoropyridin-2-yl]-5-methyl-2-pyrimidin-2-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H24FN7
assistant