COc1cc(C(=O)NCC(=O)N/N=C/c2ccc(-c3ccc([N+](=O)[O-])cc3)o2)cc(OC)c1OC
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?