CCN1C(=O)[C@@H]2[C@@H](CC[C@@H]3C(=O)C[C@@H](O)[C@@H](O)[C@H]32)C1=O
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?