Cc1ccccc1-n1c(C)c(C#N)c([O-])c(-[n+]2ccccc2)c1=S
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?