Cc1c(N2C(=O)C(O)=C(C(=O)c3ccc(Cl)cc3)C2c2ccccc2)c(=O)n(-c2ccccc2)n1C
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?