Cc1ccc(NC(=O)CSc2nc3ccccc3c(=O)n2CCCN2CCCCC2)cc1Cl
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?