CCOC(=O)c1ccc(NC(=O)Cn2c3ncccc3c(=O)n2-c2ccc(C)c(C)c2)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?