You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 2-[3-(5-ethylfuran-2-yl)propanoylamino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate into its molecular formula.
user
C19H23NO4S
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