Cc1ccc(C(=O)CSc2nc(O)c3cc(C(=O)NCCN4CCCCC4)ccc3n2)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?