CN1CCN(c2cc3c(c4c2[nH]c2ccccc24)C(=O)CC(C)(C)C3)CC1.Cl
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?