You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
S-[2-[2-[(2-amino-6-oxo-1H-purin-9-yl)methoxy]ethoxy-(benzylamino)phosphoryl]oxyethyl] 3-hydroxy-2,2-dimethylpropanethioate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H31N6O7PS
assistant