CCN(CC(=O)Nc1cccc(S(N)(=O)=O)c1)Cc1nc(O)c2ccccc2n1
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?