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system
Name the molecular formula for the molecule established as (9S)-9-(2,3-dimethoxyphenyl)-2-ethylsulfanyl-5,6,7,9-tetrahydro-4H-[1,2,4]triazolo[5,1-b]quinazolin-8-one using the IUPAC nomenclature.
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C19H22N4O3S
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