O=C(O)[C@]12C[C@]3(C(=O)O)C[C@@](C(=O)O)(C[C@](C(=O)O)(C1)C3=O)C2=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?