Cc1cccc(Cc2c(C)nc3nc(SCC(=O)NCc4ccco4)nn3c2C)c1
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?