28666-87-7 3,5,7-Trimethylthiazolo(3,2-a)pyrimidin-4-ium perchlorate 3,5,7-Trimethylthiazolo(3,2-a)pyrimidine perchlorate Thiazolo(3,2-a)pyrimidin-4-ium, 3,5,7-trimethyl-, perchlorate