COc1ccc(/C=c2/sc3n(c2=O)C(c2ccccc2)C2(O)CCCCC2N=3)cc1
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?