Cc1ccc(S(=O)(=O)N(c2cc(Cl)c(O)c(Cl)c2)P(=O)(OC(C)C)OC(C)C)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?