CCPA (2-Chloro-N6-cyclopentyladenosine) a highly selective A1 adenosine receptors agonist with a Ki of 0.4 nM. CCPA selectively binds to adenosine A1 over adenosine A2 receptors (Ki of 3900 nM). CCPA is a purine nucleoside analog. Purine nucleoside analogs have broad antitumor activity targeting indolent lymphoid malignancies. Anticancer mechanisms in this process rely on inhibition of DNA synthesis, induction of apoptosis, etc[1][2][3].