You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-phenyl-1-[[3-[4-(trifluoromethoxy)phenyl]-1,2,4-oxadiazol-5-yl]methyl]-4a,7a-dihydrothieno[3,2-d]pyrimidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H15F3N4O4S
assistant