You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 1-[[2-(N-acetyl-2-methoxyanilino)-1,3-thiazol-4-yl]methyl]piperidine-4-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C21H27N3O4S
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