You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(4-oxo-3H-quinazolin-2-yl)sulfanyl]-N-[4-(trifluoromethyl)phenyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H14F3N3O2S
assistant