CC(=O)N1CCc2cc(Br)cc(S(=O)(=O)NCCCN3CCC(C)CC3)c21
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?