Cc1ccc2c(c1)CCCN2S(=O)(=O)c1cccc(C(=O)Nc2ccccc2C(=O)O)c1
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?