Oc1c(C(c2ccccc2)N2CCN(c3ccccc3)CC2)sc2nc(-c3ccco3)nn12
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?