You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z,7S)-8,8-diethyl-10-fluoro-1-imino-2-methylspiro[6H-3-benzazecine-7,3'-[1,3]oxazolo[3,4-a]pyridin-4-ium]-1'-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H25FN3O2+
assistant