A collection of aryl sulfonamido indanes based on the lead compound 1 was synthesized and evaluated for Kv1. 5 inhibitory activity. Kv1. 5 inhibitors have the potential to be atrium- selective agents for treatment of atrial fibrillation.(1R, 2R)-1 has an IC50 of 0.033 μM against Kv1. 5 and is selective against other cardiac ion channels, including hERG.