You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3R,4S,5R)-2-[5-chloro-7-(cyclopentylamino)triazolo[4,5-d]pyrimidin-3-yl]-5-[(1-diethoxyphosphoryl-2-hydroxyethoxy)methyl]oxolane-3,4-diol by IUPAC nomenclature, provide its molecular formula.
user
C20H32ClN6O8P
assistant