COc1ccc(OC)c(CCNC(=O)C(=O)Nc2ccc3nc4n(c(=O)c3c2)CCCCC4)c1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?