Ic1ccc2c(c1)N(c1ccccc1)c1cc([N-]c3ccc4nc5ccc(I)cc5[n+](-c5ccccc5)c4c3)ccc1N2
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?