Cc1cc(Br)c(NC(=O)CN2C(=O)NC3(CCOc4ccccc43)C2=O)c(Br)c1
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?