CCOC(=O)c1ccc(NC(=O)c2[nH]cnc2C(=O)N[C@@H](CC(C)C)C(=O)OC(C)(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?