You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl (6R)-3-ethyl-4-[[(3R)-4-(4-fluorobenzoyl)-3-methylpiperazin-1-yl]methyl]-2-oxo-6-phenyl-1,6-dihydropyrimidine-5-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C28H33FN4O4
assistant