COC(=O)/C(=N/NC(C)(C)C)C(C(=O)OC)C(=O)C(=O)Nc1nc2ccc([N+](=O)[O-])cc2s1
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?