COc1ccc(NC(=O)Cn2c(=O)n(-c3ccc(C)cc3)c(=O)c3c2c2cc(C)ccc2n3C)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?