Cc1c(OC(C(=O)O)c2ccccc2)ccc2c(-c3ccccc3)cc(=O)oc12
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?