You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[(1S,3R,4R,7S)-3-[6-[(3-chlorophenyl)methylamino]purin-9-yl]-7-hydroxy-2,5-dioxabicyclo[2.2.1]heptan-1-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C19H19ClN6O4
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