6-Ethyl-2-(ethylsulfanyl)-6-methyl-5,8-dihydro-6H-pyrano[4',3':4,5]thieno[2,3-d]pyrimidin-4-amine;6H-Pyrano[4',3':4,5]thieno[2,3-d]pyrimidin-4-amine, 6-ethyl-2-(ethylthio)-5,8-dihydro-6-methyl-
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