You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-amino-9-[(2R,5S)-5-[[[(2R,5R)-5-(5,6-dichlorobenzimidazol-1-yl)-2-dihydroxyphosphinothioyloxyoxolan-3-yl]oxy-methylphosphoryl]oxymethyl]oxolan-2-yl]-7H-purin-8-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25Cl2N7O9P2S
assistant