You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 7-[3-(aminomethyl)-3a,4,6,6a-tetrahydropyrrolo[3,4-d][1,2]oxazol-5-yl]-1-(2,4-difluorophenyl)-6-fluoro-4-oxo-1,8-naphthyridine-3-carboxylic acid ?
user
C21H16F3N5O4
assistant