You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2R,3R,4S,5R)-5-(4-chlorophenyl)-4-nitro-3-(trifluoromethyl)pyrrolidine-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H12ClF3N2O4
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