CCN1CCCC1CN(Cc1cc2ccc(C)cc2nc1O)C(S)=Nc1ccc(OC)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?