C[C@@H]1C2C[C@@]34COC(=O)C3=CC=C[C@H]4[C@@]13C[C@H](c1ccoc1)O[C@@H]3O2
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?