O=C(CC1C[C@H](C(=O)N2CCCCC2)[C@@]2(CCc3ccccc3)c3[nH]c4ccccc4c3CCN2C1=O)NCc1cccc(C(F)(F)F)c1
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.