COc1cccc(NS(=O)(=O)c2ccc3c(c2)CCCN3C(=O)C2CCC2)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?