C[C@H](CO)NC(=O)[C@H](C)[C@@H]1C[C@@]1(C)[C@@H](NC(=O)OCc1ccccc1)c1ccccc1
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?