O=C(NCCCCNC(=O)c1nc[nH]c1C(=O)Nc1cccc(Cl)c1)c1nc[nH]c1C(=O)Nc1cccc(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?