C=CCn1c(C)cc(C(=O)CSc2nnc3n(CCC)c(=O)c4ccccc4n23)c1C
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?