2-(1-Piperazinyl)-4-(4-thiomorpholinyl)pyrido(3,2-d)pyrimidine S-oxide dihydrochloride 2-Piperazino-4-(1'-oxido-thiomorpholino)pyrido(3,2-d)pyrimidine dihydrochloride 39547-34-7 Pyrido(3,2-d)pyrimidine, 2-(1-piperazinyl)-4-(4-thiomorpholinyl)-, S-oxide, dihydrochloride