CN(CC(=O)Nc1cccc(S(=O)(=O)N2CCCC2)c1)Cc1ccc2c(c1)OCO2
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?