Cc1ccc(-n2c(SCC(=O)NCc3ccco3)nc3nc4c(cc3c2=O)COC(C)(C)C4)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?