O=C(C1=C(O)C(=O)N(Cc2cccnc2)C1c1cccc([N+](=O)[O-])c1)c1ccc2c(c1)OCO2
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?