COC(=O)C(NC(=O)C12CCC(C)(C(=O)O1)C2(C)C)c1cc(C(C)(C)C)c(O)c(C(C)(C)C)c1
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?