Cn1c(=O)c2c(nc(SC3C(=O)CC(C)(C)CC3=O)n2C)n(C)c1=O
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?