You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aS,9aS)-7-[2-(4-fluorophenoxy)acetyl]-4-methyl-4a,5,6,8,9,9a-hexahydro-[1,4]oxazino[2,3-d]azepin-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21FN2O4
assistant