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,6E)-6-[[3-(2-aminoethylcarbamoyl)pyridin-2-yl]methylidene]-3,3-dimethyl-7-oxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid is given. What is its corresponding molecular formula?
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C18H22N4O4
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