COc1ccc2[nH]c3c([N+](=O)[O-])ccc(NCCN(C)C)c3/c(=N/CCN(C)C)c2c1
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?