CC1C(=O)CCC2[C@]1(C)CCC1[C@]3(C)CC[C@@]4(C)CCC(C)(C)CC4[C@]3(C)CC[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?