You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule N-[[3-(4-chlorophenyl)-1-(cyclopropylmethyl)-2,2-dioxo-2lambda6-thia-1-azaspiro[4.4]non-3-en-4-yl]methyl]-N-ethylpropanamide into molecular formula.
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C23H31ClN2O3S
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