CCN(CC)CC.CCc1ccc(-n2c(=S)sc3c(=O)n(-c4ccccc4OC)c(=S)[nH]c32)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?