CC(C)C[C@@H](CC(=O)N[C@@H](CCCN)CC(=O)N[C@@H]1CCNC[C@H]1C(=O)N[C@H](CC(=O)N[C@@H](CCC(=O)O)CC(=O)O)CC(C)C)NC(=O)[C@@H]1CNCC[C@H]1N
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?