CCCCOc1ccc(CNC(=O)Cc2ccc(NC(=O)N3CCCCc4ccccc43)cc2)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?