You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-5-[[4-methyl-4-(5-methyl-1,3-thiazol-2-yl)piperidin-1-yl]methyl]-1,3-thiazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H21N3S2
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