COC(=O)C(I(OS(=O)(=O)c1ccc(C)cc1)c1ccccc1)=P(c1ccccc1)(c1ccccc1)c1ccccc1
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?