CCCc1nc2sc3c(c2c(=O)n1NC(=O)CCC(=O)OC)CCCC3
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?