COC(=O)C1=C(C(=O)OC)C23CC1C1C(C(=O)OC)=C(C(=O)OC)C12C1C=CC3C2C(=O)OC(=O)C21
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?