CO[C@@H]1COC(=O)C/C=C/[C@@H](C)[C@@H]2C=C[C@H](O)[C@@H](COC(=O)C/C=C\[C@H]1C)O2
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?