CS[C@]12C(=O)C[C@@]3(C)[C@@H](CC[C@]3(O)C(=O)CO)[C@@H]1CCC1=CC(=O)CC[C@@]12C
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?