Cc1ccc(C)c(N2CCN(C(=O)c3ccc(CSc4nc5cc[nH]cc-5n4)cc3)CC2)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?