COc1ccc(-n2c(Cc3cc(O)nc(O)n3)nnc2SCC(=O)N2CCC(C)CC2)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?