O=C(C[n+]1ccccc1)NNC(=O)/C(=C/c1ccc2c(c1)OCO2)NC(=O)c1ccccc1.[Cl-]
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?