CC(C)(C)OC(=O)N[C@@H](Cc1ccccc1)C(=O)NC[C@H]1CC[C@H](C(=O)N[C@@H](CCC(N)=O)C(=O)O)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?