C=CC[C@@H](CC(=O)NCCO)C(=O)NC[C@@H](OC(=O)[C@H](CC=C)CC(=O)OC(C)(C)C)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?