CCN1CCN(CCNC(=O)c2ccc3c(c2)NC(=O)/C(=C\c2cccc(Cl)c2)S3)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?