3,6-Diaminoacridine hemisulfate is a multifunctional acridine compound. 3,6-Diaminoacridine hemisulfate is an acridine dye and also a DNA inserter. 3,6-Diaminoacridine hemisulfate is a potent broad-spectrum antibacterial agent. Its mechanism is to insert into bacterial DNA, interfering with replication and transcription, leading to bacterial lysis. 3,6-Diaminoacridine hemisulfate is a Kir3.2 potassium channel blocker and can be used to study the neurological phenotype of Down syndrome. 3,6-Diaminoacridine hemisulfate can penetrate the stratum corneum of the skin and accumulate in the cell nucleus. Long-term exposure may induce skin cancer or other malignant tumors[1][2][3].