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Oxidative dehydration of 1-(butylthio)anthraquinone-2-carboxamide afforded 1-(butylsulfonyl)-9,10-dioxo-9,10-dihydroanthracene-2-carbonitrile and 1-butyl-6,11-dihydro-3H-1λ4-anthra[2,1-d]isothiazole-3,6,11-trione 1-oxide as a by-product.