COC(=O)C1C(O)C(C)C(=O)C(C)/C=C\C=C(C)C(=O)Nc2c(C)c(OC(C)=O)c3c(c2O)C(=O)C(C)=C2OCOC(=C23)C(C)=CC(C)(O)C(O)C(C)C1O
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?