You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[(5-chlorothiophen-2-yl)methyl]-1-(furan-2-carbonyl)piperazin-2-yl]-pyrrolidin-1-ylmethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22ClN3O3S
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