You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[2-[4-[(4-fluorophenyl)methylcarbamoyl]-5-hydroxy-6-oxo-1H-pyrimidin-2-yl]-1-methoxypropan-2-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27FN4O6
assistant