CC(C)(C)OC(=O)CC(NC(=O)OC(C)(C)C)C(=O)N[C@@H]1CCCC[C@H]1C(=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?