O=C(O)[C@]1(S(=O)(=O)c2ccccc2)C[C@@H]2ON=C(c3cccc(Br)c3)[C@@H]2C1
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?