3-Isopropoxy-1-methyl-1,2,3,4-tetrahydropyrimido(1,2-a)benzimidazole methanesulfonate 79513-71-6 Pyrimido(1,2-a)benzimidazole, 1,2,3,4-tetrahydro-8-isopropoxy-1-methyl-, methanesulfonate