O=C(Nc1ccc2[nH]c(C(=O)N3CC(CCl)c4ccc([N+](=O)[O-])cc43)cc2c1)c1cc2ccccc2o1
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?