Cc1cccc(-c2nc(C[S+]([O-])CC(=O)N3CCN(C)CC3)c(C)o2)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?