Cc1n[nH]c(O)c1C(c1ccc(-c2ccccc2C(=O)O)o1)c1c(C)n[nH]c1O
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?