COCCN=C(S)N1C2CCC1CC(NC(=O)NC13CC4CC(CC(C4)C1)C3)C2
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?