COc1ccc([C@@H]2CC(=O)c3c(O)cc(O[C@@H]4OC(CO[C@@H]5OC(C)[C@H](O)[C@H](O)C5O)[C@@H](O)[C@@H](O)C4O)cc3O2)cc1O
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?