COC(=O)c1ccc2c(=O)n(CCCCCC(=O)NCCNC(C)=O)c(=O)[nH]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?