Cc1ccc2c(nc3s/c(=C\c4ccc(-c5ccccc5C(=O)O)o4)c(=O)n32)c1C
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?