COc1ccccc1NC(=O)C(C)OC(=O)Cn1cnc2c1c(=O)n(C)c(=O)n2C
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?