You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,4R)-1-(4,4-difluorocyclohexyl)-3-fluoro-4-(4-methoxyphenyl)pyrrolidine-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H22F3NO3
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