COc1ccc(-n2c(Cc3cccn3C)nnc2SCC(=O)Nc2cccc(C)c2C)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?