77776-86-4 8-(2-Diethylaminoethyl-thio)-4-(1-oxidothiomorpholino)-2-piperazino-pyrimido(5,4-d)pyrimidine Ethanamine, N,N-diethyl-2-((6-(1-piperazinyl)-8-(4-thiomorpholinyl)pyrimido(5,4-d)pyrimidin-4-yl)thio)-, S-oxide