You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[[(2R,3S,4R,5R)-5-(6-amino-2-chloropurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C12H15ClN6O4
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