CCN1CCCc2cc(CN(CCN3CCOCC3)C(S)=Nc3ccc(C)cc3)ccc21
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?