COCCCn1c(SCC(=O)NNC(=O)c2cccc(O)c2)nnc1-c1ccncc1
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?