You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-N-[2-methyl-6-[1-(oxan-4-yl)pyrrolidin-2-yl]pyrimidin-4-yl]-1,3-thiazol-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H25N5OS
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