COC(=O)[C@H]1CO[C@H]2C/C(C)=C/CC/C(C)=C/CC[C@@]3(C)O[C@@H]3C[C@H]21
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?