C[C@]12C[C@H](O)C3[C@@H](CCC4=CC(=O)C=C[C@@]43C)C1CC[C@]2(O)C(=O)COC(=O)CCC(=O)O
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?