COc1ccc(OC)c(C2C(C(=O)c3ccc4c(c3)OCCO4)=C(O)C(=O)N2CC2CCCO2)c1
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?