CC(C)C(Sc1nc(-c2ccccc2)c(-c2ccccc2)[nH]1)C(=O)NNC(=S)Nc1ccccc1
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?