Cc1cccc(N2C(=O)C3C(c4ccccc4)OC4(C(=O)c5ccccc5C4=O)C3C2=O)c1
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?