COc1cccc(CN(C)C(=O)c2cccc(NC(=O)CC3SC(N4CCCCC4)=NC3=O)c2)c1OC
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?