You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[4-[4-(3,4-dimethyl-4,5-dihydro-2H-pyrimidin-2-yl)piperazin-1-yl]-4-oxobutyl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H35N5O3
assistant