O=C(c1ccc2c(c1)N(Cc1ccccc1)C(=O)c1ccccc1S2(=O)=O)N1CCN(c2ccccn2)CC1
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?