(R)-Phe-A110/B319
(R)-Phe-A110/B319, a hapten, is a selective binder to tumor-associated antigens. (R)-Phe-A110/B319 has a 20-fold higher affinity towards the H1047R mutant of p110α in the p110α/p85α PI3K complex. (R)-Phe-A110/B319 can be used for the research of conditional chimeric antigen receptor T (CAR-T) cell activation and tumor targeting.