CC(C)CC(NC(=O)OC(C)(C)C)C(=O)NC(CCC(=O)OCc1ccc([N+](=O)[O-])cc1)C(=O)OCc1ccc([N+](=O)[O-])cc1
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?