Cc1ccc(C)c(C(=O)CSc2nc3cc(C(=O)NC4CCCC4)ccc3c(=O)n2CC2CCCO2)c1
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?