You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[(3,4-dichlorophenyl)methyl]-4-[(2-methylpropan-2-yl)oxycarbonyl]-2H-cyclopenta[b]pyrrole-2-carboxylic acid .
user
C20H19Cl2NO4
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