You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-N-[4-(4-methyl-1,3-thiazol-2-yl)butyl]-3-piperidin-1-ylsulfonylbenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H29N3O3S2
assistant