O=C(NCCN(CCNC(=O)c1nc[nH]c1C(=O)Nc1ccc(Cl)cc1)CCNC(=O)c1nc[nH]c1C(=O)Nc1ccc(Cl)cc1)c1nc[nH]c1C(=O)Nc1ccc(Cl)cc1
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?