NC(=O)c1ccc(NC(=O)CCCN2C(=O)NC3(CCCC3)C2=O)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?