COC(=O)C1(C(=O)OC)C2C(=O)C3C(C21)C3(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C
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?