CCc1ccc(NC(=O)Cn2c(=O)n(CCCCC(=O)NCCc3ccc(Cl)cc3)c(=O)c3ccccc32)cc1
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?