CCOc1cccc2cc(-c3csc(NC(=O)CCC(=O)NCCN4CCCCC4C)n3)c(=O)oc12
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?