COc1ccc(NC(=O)CN(C)C(=O)c2ccc3c(c2)S(=O)(=O)N=C2CCCCCN23)cc1
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?