WL47 TFA, a high-affinity cavolin-1 (CAV1) ligand (Kd=23 nM), is a potent disrupter of CAV1 oligomers. WL47 TFA shows selectivity for CAV1 over BSA, casein and HEWL. WL47 TFA is 80% smaller in length than the original T20 (HY-P0052) parent sequence and can be used for the study of caveolin-1 function.