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 5-[(4-ethyl-3-methoxycarbonyl-5-methylthiophen-2-yl)amino]-3-methyl-5-oxopentanoic acid is given. What is its corresponding molecular formula?
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C15H21NO5S
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