C=C1C[C@]23CC[C@H]4C(CO)(CO)C[C@@H](O)C[C@@]4(C)[C@@H]2CC[C@H]1C3
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?