COC(=O)[C@@H](NC(=O)O[C@H]1C(=O)c2cc(OC)ccc2O[C@@H]1c1ccc(OC)c(Br)c1)C(C)C
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?