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 [2-[[(6S)-3-carbamoyl-6-methyl-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]amino]-2-oxoethyl] 1-oxidopyridin-1-ium-4-carboxylate is given. What is its corresponding molecular formula?
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C18H19N3O5S
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