Cc1ccc(N(C(=O)CCC(=O)Nc2cc(C)on2)C(C(=O)NC2CCCC2)c2ccccc2)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?