COC(=O)[C@@]1(Cc2ccccc2)[C@H]2c3cc(C(=O)N(C)C)n(Cc4nc5ccccc5[nH]4)c3C[C@H]2CN1C(=O)c1ccccc1
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?