Cc1ccc(-n2c(=O)c3c(cnn3C)n(CC(=O)Nc3cc(C)ccc3C)c2=O)cc1
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?