O=C(O)C(=O)O.O=c1c2cc(Br)ccc2nc(-c2ccccc2Cl)n1NCC1(O)OCC(O)C(O)C1O
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?