You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-fluoro-3-[3-(2-methylcyclopropyl)-1,2,4-oxadiazol-5-yl]-5-(2-methyloxolan-2-yl)-3,3a-dihydroimidazo[1,5-a]quinoxalin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22FN5O3
assistant