CN(CCNC(=O)c1ccc(CS(=O)(=O)c2ccc(Br)cc2)o1)CCc1ccccc1
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?