CCOc1ccc(NC(=O)Cn2c(=O)n(CCc3ccccc3)c(=O)c3c4c(sc32)CCCC4)cc1
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?