CC1(C)CC[C@]2(C(=O)O)C(O)C[C@@]3(C)C(=CCC4[C@]3(C)CCC3C(C)(C)C(O)CC[C@@]34C)C2C1
PSA is a commonly used medicinal chemistry metric for the optimization of a drug's ability to permeate cells. Please predict psa of this molecule.