You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named [(2R)-1-ethylpyrrolidin-1-ium-2-yl]methyl-[2-oxo-2-[[(1R,2R,4S)-2,3,3-trimethyl-2-bicyclo[2.2.1]heptanyl]amino]ethyl]azanium is given. What is its corresponding molecular formula?
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C19H37N3O+2
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