Cc1ccc(CN2CCC(CNC(=O)c3cnn(-c4ccccc4)c3C3CCN(C(=O)OC(C)(C)C)CC3)CC2)cc1
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?