Cc1nc(/N=N\c2cc(S(=O)(=O)O)ccc2S(=O)(=O)O)c(COP(=O)(O)O)c(C=O)c1O
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?