NCCCCNCCCNC(=O)CNC(=O)CC(O)C(N)CCCC(NC(=O)C(CN)NC(=O)C(O)CNC(=O)CC(N)c1ccc(O)cc1)C(=O)O
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?