O=C(NCCCO)/C(=C\c1cn(-c2ccccc2)nc1-c1cccnc1)NC(=O)c1ccccc1
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?