C[C@H]1CC(=O)[C@@]2(O)C#C/C=C\C#C[C@@H]3Nc4c(cc(O)c5c4C(=O)c4ccccc4C5=O)[C@]24O[C@@]134
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?