Cc1ccc(OCC(=O)NC(=S)Nc2ccc(S(=O)(=O)Nc3cc(C)on3)cc2)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?