CCC(C(=O)NCc1ccccc1OC)n1nc(C)n2c(cc3occc32)c1=O
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?