O-1918 is primarily used in scientific research to study the endocannabinoid system. It acts as an antagonist for the putative cannabinoid receptor GPR55, which helps researchers understand the receptor's role in various physiological processes. This compound is particularly valuable in investigating the effects of cannabinoids on pain, inflammation, and cancer. By blocking GPR55, O-1918 allows scientists to isolate and analyze the receptor's specific contributions to these conditions. Its application is crucial in developing targeted therapies for diseases where GPR55 signaling is implicated.