4-(4-Morpholinyl)-8-((phenylmethyl)thio)-2-(1-piperazinyl)pyrimido(5,4-d)pyrimidine 77749-49-6 8-Benzylthio-4-morpholino-2-piperazino-pyrimido(5,4-d)pyrimidine Pyrimido(5,4-d)pyrimidine, 4-(4-morpholinyl)-8-((phenylmethyl)thio)-2-(1-piperazinyl)- RX-RA 69