You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-(3-chloro-2,5-dioxo-4-thiophen-2-ylpyrrol-1-yl)piperidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H17ClN2O4S
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