Desacetyllanatoside C is primarily used in the field of cardiology due to its potent cardiac glycoside properties. It is employed in the treatment of various heart conditions, including congestive heart failure and certain types of arrhythmias. The compound works by increasing the force of myocardial contractions and improving cardiac output, which helps in alleviating symptoms associated with heart failure. Additionally, it aids in controlling heart rate in patients with atrial fibrillation, contributing to more stable and efficient heart function. Its application is carefully monitored due to its narrow therapeutic index, requiring precise dosing to avoid toxicity.