You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(4-methoxyphenyl)ethyl]-6-methyl-2-(4-methylpiperazin-1-yl)pyrimidine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27N5O2
assistant