CCN=C(S)NNC(=O)CCc1nc2cc(Cl)ccc2n(Cc2ccccc2)c1=O
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?