O=C(NC(c1ccccc1)c1ccccc1)c1nc[nH]c1C(=O)N[C@@H](Cc1ccccc1)C(=O)OCc1ccccc1
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?