COC(=O)[C@H](Cc1c[nH]c2ccccc12)n1cc(-c2cc(C(=O)N3CCN(C(=O)OC(C)(C)C)CC3)cc(-c3cn([C@@H](CCC(=O)OC(C)(C)C)C(=O)OC(C)(C)C)nn3)c2)nn1
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?