COC(=O)[C@]12CCC(C)(C)C[C@H]1C1=CC[C@@H]3[C@@]4(C)CC[C@H](OC5OC(CO)C(O)C(O)C5OC5OC(CO)C(O)C(O)C5O)C(C)(C)[C@@H]4CC[C@@]3(C)[C@]1(C)CC2
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?