CL264 is a hydrophilic molecule. CL264,an adenine analog, is a potent and selective toll-like receptor 7 (TLR7) agonist with no TLR8-stimulating potency. This bioactive small molecule belongs to the category of 9-benzyl-8-hydroxyadenine derivatives. It contains a glycine molecule attached to the benzyl group. Studies show that CL264 is capable of activating NF-κB and stimulating the secretion of IFN-α in cells that express TLR7. CL264 is commonly used at a concentration range from 2 ng/mL to 10 μg/mL for stimulating cells in cultures.