CCCC1(C(=O)OCC)NC(c2ccc(OC)cc2OC)C2C(=O)N(c3ccc4c(c3)OCCO4)C(=O)C21
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?