COCCNC(=O)CCC(=O)NNc1nc2ccccc2c2nc(-c3ccccc3)nn12
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?