(-)-Chromanol 293B is primarily used in research and pharmaceutical studies due to its role as a selective inhibitor of the slow component of the delayed rectifier potassium current (IKs) in cardiac cells. This makes it a valuable tool for studying cardiac electrophysiology and arrhythmias. It helps researchers understand the mechanisms underlying certain types of heart rhythm disorders, particularly those related to prolonged QT intervals. Additionally, it is utilized in the development and testing of potential antiarrhythmic drugs, providing insights into the modulation of potassium channels in the heart. Its specificity for IKs channels also aids in exploring the physiological and pathological roles of these channels in various tissues.