CC(=O)OC1COC(N2C(=O)/C(=N\Nc3ccc([N+](=O)[O-])cc3)c3cc(Br)c([N+](=O)[O-])cc32)C(OC(C)=O)C1OC(C)=O
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?