C[C@@H]1O[C@@H](O[C@H]2C[C@@H](O)[C@]3(CO)[C@@H]4C(CC[C@]3(O)C2)[C@@]2(O)CC[C@H]([C@@H]3COC(=O)C3)[C@@]2(C)C[C@H]4O)[C@H](O)[C@H](O)[C@H]1O
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?