Bay 65-1942 R form is primarily used in research settings as a selective inhibitor of the enzyme phosphodiesterase 3 (PDE3). Its application is significant in studying cardiovascular diseases, as PDE3 plays a critical role in regulating cyclic AMP levels, which influence heart muscle contraction and vascular smooth muscle relaxation. Researchers utilize this compound to explore its potential therapeutic effects in conditions like heart failure and pulmonary hypertension. Additionally, it serves as a tool in pharmacological studies to understand the mechanisms of PDE3 inhibition and its impact on cellular signaling pathways. Its specificity makes it valuable for targeted investigations in both in vitro and in vivo models.