2-(1'-Oxido-thiomorpholino)-4-piperazino-pyrido(3,2-d)pyrimidine dihydrochloride 39551-47-8 4-(1-Piperazinyl)-2-(4-thiomorpholinyl)pyrido(3,2-d)pyrimidine S-oxide dihydrochloride Pyrido(3,2-d)pyrimidine, 4-(1-piperazinyl)-2-(4-thiomorpholinyl)-, S-oxide, dihydrochloride