KL001 is primarily used in research settings to study circadian rhythms and their regulation. It functions as a small molecule inhibitor that targets the CRY protein, which plays a key role in the circadian clock. By modulating CRY activity, KL001 helps researchers understand the molecular mechanisms underlying circadian rhythms and their impact on biological processes such as sleep, metabolism, and hormone regulation. This makes it a valuable tool for exploring potential therapeutic interventions for circadian rhythm disorders and related conditions.