CC(C)(C)OC(=O)C[C@@H]1C/C=C\C[C@H](CC(=O)N[C@@H](CO)Cc2ccccc2)C(=O)N[C@H](C(C)(C)C)COC1=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?