COCCNc1nc(Oc2ccc(CC(=O)OC)cc2)c2sc(-c3ccccc3)cc2n1
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?