CCC1=NC(C(F)(F)F)(C(F)(F)F)N=C(/N=C(/N)N(C)C(C(C)C)P(=O)(OC(C)C)OC(C)C)O1
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?