Cc1nn(Cc2nnc(SCC(=O)Nc3cccc(C(F)(F)F)c3)n2C)c(C)c1[N+](=O)[O-]
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?