COC(=O)C(CC1=C(O)Nc2ccccc2N1)/C(=N/NC(N)=O)C(=O)Nc1ccccc1C
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?