Cc1ccc(-c2nnc(SCC(=O)n3c4c(c5ccccc53)CCCC4)o2)cc1
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?