CCc1ccc2nc(O)c(CN(Cc3ccccc3OC)C(=O)Nc3ccccc3OC)cc2c1
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?