Cc1ccccc1-n1c(SCc2cc(=O)n3ccccc3n2)nc2nncc-2c1O
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?