CCCN1C2=C(C(=O)CCC2)C(c2ccc(O)c(Br)c2)C2=C1CCCC2=O
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?