You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-9-[(2R,3S,5S)-5-(dihydroxyphosphinothioyloxymethyl)-3-(2-methoxyethoxy)oxolan-2-yl]-1H-purin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H20N5O7PS
assistant