COC(=O)CN1C(=O)[C@H]2[C@@H](C1=O)[C@@H](c1ccc(C)o1)N1C(=O)CN(CCO)C(=O)[C@@]21C
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?