You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2R,3S,4R,5R)-2-[[[(Z)-4-aminobut-2-enyl]-methylamino]methyl]-5-(6-ethoxypurin-9-yl)oxolane-3,4-diol into its molecular formula.
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C17H26N6O4
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