1,2,4-Triazolo(4,3-b)pyridazine, 3-methyl-6-(4-morpholinyl)- 3-Methyl-6-(4-morpholinyl)-1,2,4-triazolo(4,3-b)pyridazine 3-Methyl-6-morpholino-s-triazolo(4,3-b)pyridazine 56383-11-0