CCOP1(=O)N/C(=N/C2=NC(C(F)(F)F)(C(F)(F)F)OC(C(F)(F)F)(C(F)(F)F)O2)N(C)C1(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.