C[C@@H](CCO)OC1OC(COC(=O)C(C)(C)C)C(OC(=O)C(C)(C)C)C(OC(=O)C(C)(C)C)C1OC(=O)C(C)(C)C
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?