149246-67-3 4,7-Dihydro-4-ethyl-2-(2-thienyl)pyrazolo(1,5-a)pyrimidin-7-one 4-Ethyl-2-(2-thienyl)pyrazolo(1,5-a)pyrimidin-7(4H)-one Pyrazolo(1,5-a)pyrimidin-7(4H)-one, 4-ethyl-2-(2-thienyl)-