You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-N-(1,3-benzodioxol-5-yl)-4-N-(2,4-difluorophenyl)-2-methylpyrimidine-4,6-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H14F2N4O2
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