[1]Benzothieno[2,3-d]pyrimidin-4(3H)-one, 3-ethyl-5,6,7,8-tetrahydro-;3-Ethyl-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one;3-Ethyl-5,6,7,8-tetrahydro-3H-benzo[4,5]thieno[2,3-d]pyrimidin-4-one
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