COc1cc2nc(N3CCN(C(=O)OCc4ccccc4)[C@H](C(=O)NC(C)(C)C)C3)nc(N)c2cc1OC.O
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?