Cc1c(-n2c(S)nnc2-c2ccccc2Cl)c(=O)n(-c2ccccc2)n1C
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?