Cc1csc(SCCn2c(N3CCOCC3)nc3c2c(=O)[nH]c(=O)n3C)n1
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?