COc1cc2c(cc1O)[C@H](Cc1ccc(Oc3cc(C[C@@H]4NCCc5cc(OC)c(O)cc54)ccc3O)cc1)NCC2
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?