N#C/C(=N\Nc1ccc(S(=O)(=O)N2CCc3ccccc32)cc1)C(N)=S
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?