CO[C@@H]1COC(=O)[C@H]2CCCN2C(=O)C/C=C\[C@H](C)[C@@H](OC)COC(=O)C/C=C\[C@H]1C
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?