Novel Piperidinyl-Azetidines as Potent and Selective CCR4 Antagonists Elicit Antitumor Response as a Single Agent and in Combination with Checkpoint Inhibitors. - Robles O; Jackson JJ; Marshall L; Talay O; Chian D; Cutler G; Diokno R; Hu DX; Jacobson S; Karbarz E; Kassner PD; Ketcham JM; et al. (Journal of medicinal chemistry, 2020)