You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,2R,3S,4S)-3-[[[2-(4-chloro-3-methylphenoxy)acetyl]amino]carbamoyl]bicyclo[2.2.1]heptane-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C18H21ClN2O5
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