You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-9-[(2R,3S)-5-[[(2S,3S,5R)-5-(6-aminopurin-9-yl)-2-(phosphanyloxymethyl)oxolan-3-yl]methoxy-sulfanylmethoxy]-3-sulfanyloxyoxolan-2-yl]-1H-purin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27N10O7PS2
assistant