You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3-ethylphenyl)-4-(oxan-4-yloxy)-2-pyridin-3-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine-6-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H29N5O3
assistant