CC1CC2C3CC(F)C4=CC(=O)C=C[C@@]4(C)[C@@]3(F)C(O)C[C@]2(C)[C@]1(O)C(=O)COC(=O)C(C)(C)C
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.