Cc1ccc(C(=O)NCCN2C3=NC[C@H](Cc4ccc(O)cc4)N3C[C@H]2Cc2ccc(O)cc2)cc1Br
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?