CCC[C@H]1C[C@H](C(=O)N[C@@H]([C@H](C)O)[C@@H]2O[C@H](SC)[C@@H](O)[C@H](O)[C@@H]2O)N(C)C1
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?