CC1CCN(C(=O)Cn2c(=O)n(CCCC(=O)NCc3ccco3)c(=O)c3sccc32)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?