CC(=O)OCC(=O)[C@@]1(OC(C)=O)[C@H](C)C[C@H]2[C@@H]3C[C@H](F)C4=CC(=O)C=C[C@@]4(C)[C@]3(F)[C@H](O)C[C@@]21C
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.