Cc1ccc(CNC(=O)c2ccc3c(=O)[nH]c4c(C(=O)NCC5CCCO5)sc(=S)n4c3c2)cc1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?