CL-197 is an orally active and long-acting purine anti-HIV nucleoside reverse transcriptase inhibitor (NRTI). CL-197 has potential effect on the research of viral, oncological and cerebrovascular diseases. CL-197 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.