CCCn1c(SCC(=O)N2c3ccccc3Sc3ccccc32)nc2c1c(=O)n(C)c(=O)n2C
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?