You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[4-(3-cyclopropyl-1H-1,2,4-triazol-5-yl)piperidin-1-yl]-2-oxoethyl]-N,3,4-trimethylbenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H29N5O3S
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