CCC(N)(C#Cc1cnc(N)c2c(-c3ccc(NC(=O)Nc4cccc(C)c4)cc3)csc12)CC
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?