O=C(NP(=O)(N1CCCC1)N1CCCC1)C1=C(N2CCOCC2)/C(=C/c2cccc([N+](=O)[O-])c2)CC1
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?