You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-benzyl-2-[[5-[2-chloro-6-(hexan-3-ylamino)purin-9-yl]-3-ethynyloxolan-2-yl]methoxy]propanedioic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H32ClN5O6
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