Cc1cc(NC(=O)CCC(=O)N(Cc2cccs2)C(C(=O)NC2CCCC2)c2ccccc2)no1
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?