Cc1ccc(N2CCN(C(=O)Cn3ncc4c([nH]c5ccc(C)cc54)c3=O)CC2)c(C)c1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?