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system
Name the molecular formula for the molecule established as (3S,9bR)-N-(1H-indol-5-yl)-2,2-dimethyl-5-oxo-3,9b-dihydro-[1,3]thiazolo[2,3-a]isoindole-3-carboxamide using the IUPAC nomenclature.
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C21H19N3O2S
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