CCCc1cc(O)nc(SCC(=O)N(CC)c2c(N)n(Cc3ccccc3)c(=O)[nH]c2=O)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?