C#CCNC(=O)C1=C[C@@H](c2cn(C(C)=O)c3ccccc23)C[C@@H](OCc2ccc(CO)cc2)O1
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?