CCR2 antagonist 4 hydrochloride is a specific CCR2 antagonist (IC50s: 180 nM for CCR2b). It potently inhibits MCP-1-induced chemotaxis (IC50: 24 nM).

CCR4 antagonist 2 (Compound 31) is a novel potent, orally bioavailable small molecule antagonists of CC chemokine receptor 4 (CCR4) that inhibits Treg trafficking into the Tumor Microenvironment without suppressing the number of Treg in healthy tissues. CCR4 antagonist 2 (Compound 31) exhibits IC50 values of Ca2+flux and (chemotaxis) CTX are 40 nM and 70 nM, respectively.

CCR2 antagonist 4 (Teijin compound 1) is a potent and specific antagonist of CCR2(IC50s of 180 nM), and potently inhibits MCP-1-induced chemotaxis(IC50 of 24 nM).