COc1ccc(COC2OC[C@]3(C)[C@H]4C5=C(CN3C(=O)OC(C)(C)C)[C@H](C)C(CO)C(CO)C5CC[C@@H]24)cc1
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?