N=C(N)Nc1ccc(CC(N)C(=O)NCC(=O)C(CC(=O)O)c2ncc(NC(=O)C(F)(F)F)o2)cc1.O=C(O)C(F)(F)F
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.