CCOC1=NC(C(F)(F)F)(C(F)(F)F)N=C(/N=C2/NP(=O)(OCC)C(C)(C)N2C)O1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?