Cc1cc(NC(=O)CCS(=O)(=O)c2cc3c4c(c2)CCN4C(=O)CC3)ccc1Br
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?