C=CC[C@H](CC(=O)OC(C)(C)C)C(=O)OC[C@H]1CCCN1C(=O)[C@H](CC=C)CC(=O)NCCO
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?