CS(=O)(=O)c1ccc2c(c1)SC1=NC(=O)/C(=C/c3ccc(O)c(O)c3)C(=N)N12
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?