CO[C@@H]1COC(=O)C/C=C\[C@@H](C)[C@@H]2C=C[C@H](O)[C@@H](COC(=O)CCC[C@H]1C)O2
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?