78552-52-0 8-Benzylamino-2-piperazino-4-thiomorpholino-pyrimido(5,4-d)pyrimidine N-(Phenylmethyl)-6-(1-piperazinyl)-8-(4-thiomorpholinyl)pyrimido(5,4-d)pyrimidin-4-amine Pyrimido(5,4-d)pyrimidin-4-amine, N-(phenylmethyl)-6-(1-piperazinyl)-8-(4-thiomorpholinyl)-