78552-37-1 8-Benzylamino-4-(1-oxido-thiomorpholino)-2-piperazino-pyrimido(5,4-d)pyrimidine Pyrimido(5,4-d)pyrimidin-4-amine, N-(phenylmethyl)-6-(1-piperazinyl)-8-(4-thiomorpholinyl)-, S-oxide