You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(2,3-dihydro-1H-inden-5-yl)-1-[(3S)-1,1-dioxothiolan-3-yl]-6-oxo-4,5-dihydropyridazine-3-carboxamide into its molecular formula.
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C18H21N3O4S
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