COc1cccc(CC(NC(C)=O)C(=O)NC2CCN(c3c(Cc4ccccc4)c(C)nc4ncnn34)CC2)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?