COc1ccc(Cn2c(=S)[nH]c3cc(C(=O)N4CCCCC4)ccc3c2=O)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?