Cc1cc(Br)c(NC(=O)CN2CC=C(c3ccccc3)CC2)c(Br)c1
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?