You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[2-[4-(difluoromethoxy)-3-methoxyphenyl]ethyl]-3-[(1S,2R)-2-methylcyclohexyl]urea by IUPAC nomenclature, provide its molecular formula.
user
C18H26F2N2O3
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