COc1ccc(NC(=O)C2=C(C)Nc3nc(CCCO)nn3C2c2ccc(OC)c(OC)c2)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?