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 tert-butyl N-[[(2S)-1-(4,5-dimethylthiophene-2-carbonyl)-4-methylpiperazin-2-yl]methyl]carbamate is given. What is its corresponding molecular formula?
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C18H29N3O3S
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