You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[6-amino-8-[(6-methyl-3-oxo-1,2-dihydroinden-5-yl)sulfanyl]purin-9-yl]-N-cyclopropylethanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22N6O3S2
assistant