Cc1ccc2c(c1)c1nnc(SCC(=O)Nc3cccc(Cl)c3C)nc1n2CC(=O)O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?