Cc1cc(C#N)c(C)c(SCc2n[nH]c3c2C(c2ccccc2)C(C#N)=C(N)O3)n1
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?