CCC(C)Sc1nnc(Cc2cc(O)nc(O)n2)n1-c1ccc(OC)cc1
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?