COc1ccc(CN(C(=O)c2snc(C(N)=O)c2N)C(C(=O)NC2CCCC2)c2cc(OC)ccc2OC)cc1
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?