O=C(Nc1nnc(C23CC4CC(CC(C4)C2)C3)s1)c1ccc(N2C(=O)CCC2=O)cc1
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?