Cc1ccccc1NC(=O)Cn1c(=O)n(CCC(=O)N2CCc3ccccc3C2)c(=O)c2ccccc21
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?