You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (5-ethyl-4-methylthiophen-2-yl)-[(3S)-3-(3-phenyl-1H-1,2,4-triazol-5-yl)piperidin-1-yl]methanone into molecular formula.
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C21H24N4OS
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