CCCC(C)C(=O)Nc1nc(C)c(-c2csc(Nc3cc(OC)ccc3OC)n2)s1
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?