COc1cccc2cc(C(C)N(CCCN3CCOCC3)C(S)=Nc3cc(C)ccc3C)oc12
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?