You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-oxo-2-[(1S,5R)-1,3,3-trimethyl-6-azabicyclo[3.2.1]octan-6-yl]ethyl] 2-methylfuran-3-carboxylate into its molecular formula.
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C18H25NO4
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