CP-91149 is primarily used in biochemical research to study glycogen metabolism. It acts as an inhibitor of glycogen phosphorylase, an enzyme crucial for breaking down glycogen into glucose. By inhibiting this enzyme, CP-91149 helps researchers understand the regulation of glycogenolysis and its impact on glucose homeostasis. This compound is particularly valuable in exploring potential therapeutic strategies for metabolic disorders such as diabetes, where abnormal glycogen metabolism plays a significant role. Additionally, it aids in investigating the role of glycogen in energy storage and utilization in various tissues, including liver and muscle. Its application extends to studying the effects of glycogen phosphorylase inhibition in conditions like hypoglycemia and glycogen storage diseases.