CCOC(=O)Cc1ccc(NC(=O)Nc2cc3c(cc2N2CCCCC2)n(C)c(=O)n3C)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?