COc1ccccc1-c1c(C(F)(F)F)oc2cc(OC(=O)c3ccc([N+](=O)[O-])c(C)c3)ccc2c1=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?