2,4,10-Trimethylpyrimido(1,2-a)benzimidazol-5-ium perchlorate 2,4,10-Trimethylpyrimido(1,2-a)benzimidazole perchlorate 57667-63-7 Pyrimido(1,2-a)benzimidazol-5-ium, 2,4,10-trimethyl-, perchlorate