Cc1ccccc1-c1nc(C[S+]([O-])CC(=O)NC(C)CCc2ccccc2)c(C)o1
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?