Cc1ccc(CSC2=Nc3ccccc3C3=NC(CC(=O)NC4CCCCC4)C(=O)N23)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?