CCOC(=O)c1ccc(NC(=O)CCc2c(C)nc3c(c(C)nn3-c3ccccc3)c2C)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?