Cc1ccc2oc(C(=O)Nc3sc4c(c3C(=O)NCC3CCCO3)CCC4)cc(=O)c2c1
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?