COC(=O)c1c(NC(=O)CN2CCN(S(=O)(=O)c3ccccc3[N+](=O)[O-])CC2)sc2c1CCC(C)C2
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?