(A) Mean descriptor values for three PROTAC with low (MZ1), average (ACBI1), and high (BI-3663) Caco-2 log Papp [20] (chemical structures in Figure S2); (B) loading plot, and (C) score plot. Color code: PROTACs = grey, bRo5 = orange, MZ1 = red, ACBI1 = white and BI-3663 in green.