You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7S)-7-(4-fluorophenyl)-2-[5-(2-methoxyethyl)-1,2,4-oxadiazol-3-yl]-5,6,7,8-tetrahydro-1H-imidazo[4,5-c]azepin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18FN5O3
assistant