Nc1nc(NC(=O)c2cccc(S(=O)(=O)N3CCCCCC3)c2)nc(-c2ccccc2)n1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?