CC(=O)NC(CC(C)C)C(=O)NC(CO)C(=O)NC(CCC(=O)O)C(=O)NC(C)C(=O)NC(CC(C)C)C(N)=O.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.