CC(C)(C)OC(=O)CC[C@H](NC(=O)C1CCN(C(=O)OC(C)(C)C)CC1)c1nnc([C@H](Cc2ccc(OC(C)(C)C)cc2)NC(=O)OC(C)(C)C)o1
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?