CCCCn1c(N)c(N(CC(C)C)C(=O)CSc2ccc([N+](=O)[O-])cc2)c(=O)[nH]c1=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?