CCCCn1c(=O)[nH]c(=O)c2c1nc(-c1ccc(-c3ccccc3Br)o1)n2CC
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?