O=C1c2ccccc2C(=O)N1CC(CN1C(=O)c2ccccc2C1=O)(C(=O)OCc1ccccc1)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?