You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[(2-ethoxypyridin-3-yl)methyl]-1-methyl-1-[1-[4-(1,2,4-triazol-1-yl)phenyl]ethyl]urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24N6O2
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