CC12CCC(C(=O)Nc3nc4ccc(Br)cc4s3)(OC1=O)C2(C)C
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?