1H-Imidazo(1,2-a)pyrimidin-4-ium, 2,3-dihydro-5,7-dimethyl-, perchlorate 2,3-Dihydro-5,7-dimethyl-1H-imidazo(1,2-a)pyrimidin-4-ium perchlorate 35327-68-5 5,7-Dimethyl-2,3-dihydroimidazo(1,2-a)pyrimidine perchlorate