COc1cc(-c2oc(/C=N/c3ccccc3)c([N+](=O)[O-])c2-c2ccc(O)c(OC)c2)ccc1O
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?