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 tert-butyl 4-[5-(4,5-dimethyl-6-oxo-1H-pyrimidin-2-yl)pyridin-2-yl]piperazine-1-carboxylate .
user
C20H27N5O3
assistant