Cc1ccc(-c2nc3scc(CCNS(=O)(=O)c4ccc(C)c(C)c4)n3n2)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?