Cc1c(NC(=O)CN2C(=O)c3ccc([N+](=O)[O-])cc3C2=O)c(=O)n(-c2ccccc2)n1C
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?