You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2R)-5-[(2-fluorophenyl)methylsulfanyl]-3-oxo-2H-imidazo[1,2-c]quinazolin-2-yl]-N-[(4-methoxyphenyl)methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H23FN4O3S
assistant