You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule ethyl 6-[(4-carbamoylpiperidin-1-yl)methyl]-4-(4-nitrophenyl)-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate .
user
C20H25N5O6
assistant