2-(1-Piperazinyl)-4-(4-thiomorpholinyl)pyrido(3,2-d)pyrimidine (Z)-2-butenedioate (1:1) 2-Piperazino-4-thiomorpholinopyrido(3,2-d)pyrimidine maleate 39547-23-4 Pyrido(3,2-d)pyrimidine, 2-(1-piperazinyl)-4-(4-thiomorpholinyl)-, (Z)-2-butenedioate (1:1)