CCN(CC)CC.COc1ccccc1-n1c(=S)[nH]c2c(sc(=S)n2-c2ccc(C)cc2C)c1=O
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?