O=S1(=O)[C@@H](c2ccccc2)[C@H](N2CCCCC2)[C@H]1[C@H]1C[C@H]2c3ccccc3[C@@H]1c1ccccc12
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?