You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(8-azabicyclo[3.2.1]octan-3-yl)-N,1,3-trimethyl-2,4-dioxopyrido[2,3-d]pyrimidine-6-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23N5O3
assistant