3-Ethyl-2-hydroxy-5-(isobutylamino)-7,7-dimethyl-6,7-dihydro-4H-thiopyrano(2,3-b)pyridin-4-one;3-Ethyl-2-hydroxy-5-(isobutylamino)-7,7-dimethyl-6,7-dihydro-4H-thiopyrano[2,3-b]pyridin-4-one
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