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 N-[(4S)-1'-ethylspiro[3,4-dihydrochromene-2,4'-piperidine]-4-yl]cyclopropanesulfonamide is given. What is its corresponding molecular formula?
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C18H26N2O3S
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