CC1NOC(NS(=O)(=O)c2ccc(/N=N/c3c(O)c(C(=O)O)cc4ccccc34)cc2)C1C
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?