You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (3aS,6aS)-1-[4-[(2,4-dichlorobenzoyl)amino]phenyl]sulfonyl-3,3a,4,5,6,6a-hexahydro-2H-cyclopenta[b]pyrrole-2-carboxylic acid using the IUPAC nomenclature.
user
C21H20Cl2N2O5S
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