CCOC(=O)c1c(NC(C)=O)sc2c(OCCN(CC)CC)c(Br)ccc12
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?