COC(=O)C1=C[C@@H](C(=O)OC)[C@@H]2C3=C(C(=O)C2(C)C)[C@H](c2ccccc2)[C@@H]2C(=O)N(C)C(=O)[C@@H]2[C@@H]3C1
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?