COC(=O)CC1C(=O)NCCN1C(=O)CSc1nc2ccccc2c(=O)n1CC(C)C
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?