You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1R)-N-[(5-methylsulfonyl-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-2-yl)methyl]-2,3-dihydro-1H-indene-1-carboxamide into its molecular formula.
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C18H22N4O3S
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