Cc1ccc(C)c(Cn2c3ccccc3c3cnn(CC(=O)NCc4ccccn4)c(=O)c32)c1
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?