COc1ccc2c(c1)OC[C@H]1[C@H]2N2C(=O)c3cc(C)ccc3NC(=O)[C@@]2(C)[C@H]1c1ccccc1
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?