CCCC(=O)OC[n+]1cccc(-c2c(COC(=O)NC(C)C)c(COC(=O)NC(C)C)c3n2CCC3)c1.[I-]
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?