CCOC(=O)c1cccc(NC(=O)CN(c2ccc(C)cc2)S(=O)(=O)c2c(C)n[nH]c2C)c1
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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?