You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[[2-(difluoromethoxy)-5-methylphenyl]methyl]-3-ethyl-2-[(2-imidazol-1-ylpyridin-4-yl)methyl]guanidine into molecular formula.
user
C21H24F2N6O
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