O=C(c1ccco1)N1CCN(CC(=O)N2CCCc3c2c(=O)oc2ccc(O)cc32)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?