C=CC[C@@H](CC(=O)N[C@H](CO)Cc1ccccc1)C(=O)N[C@H](COC(=O)[C@@H](CC=C)CC(=O)OC(C)(C)C)Cc1c[nH]c2ccccc12
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?