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 4-[(3aS,7aR)-1,3-dioxo-3a,4,7,7a-tetrahydroisoindol-2-yl]-N-(4-chloro-2-methylphenyl)butanamide using the IUPAC nomenclature.
user
C19H21ClN2O3
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