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 2-(1,3-dioxo-3a,4,7,7a-tetrahydroisoindol-2-yl)-N-(2-methyl-1,3-benzothiazol-6-yl)acetamide .
user
C18H17N3O3S
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