O=C(Nc1ccc(C2=NCCN2)cc1)c1ccc(C(=O)Nc2ccc(C3=NCCN3)cc2)c(Cl)c1
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?