N#Cc1cccc(NC(=O)c2ccc(C(=O)O)c(C(=O)c3ccc(C(=O)O)c(C(=O)Nc4cccc(C#N)c4)c3)c2)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?