1,5,7-Trimethyl-2,3-dihydroimidazo(1,2-a)pyrimidine perchlorate 1H-Imidazo(1,2-a)pyrimidin-4-ium, 2,3-dihydro-1,5,7-trimethyl-, perchlorate 2,3-Dihydro-1,5,7-trimethyl-1H-imidazo(1,2-a)pyrimidin-4-ium perchlorate 35274-43-2