Cc1c(CCC(=O)N2CCC[C@H]2C(=O)O)c(=O)oc2cc3oc4c(c3cc12)CCCC4
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?