NC(=O)N/N=C\c1ccccc1OCc1cccc(COc2ccccc2/C=N\NC(N)=O)n1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?