CCOC(=O)c1sc(NC(=O)CCN2CC(C)OC(C)C2)c(C(=O)OCC)c1C.O=C(O)C(=O)O
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?