C[C@@H](CO)N1C[C@@H](C)[C@H](CN(C)Cc2ccc(-c3ccccc3)cc2)OCc2cnnn2CCCC1=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?