You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7-[(4-chlorophenyl)methyl]-1-(2-oxopropyl)-8-[3-(trifluoromethoxy)phenoxy]-3H-purine-2,6-dione by IUPAC nomenclature, provide its molecular formula.
user
C22H16ClF3N4O5
assistant