COC(=O)C1=C(C(=O)OC)C2(C(=O)OC)OC1(OC)C(C1(C(=O)OC)C(C(=O)OC)=C1C(=O)OC)=C2C(=O)OC
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?