Cc1csc(NC(=O)C2CCN(C(=O)CSc3nnc(C)n3Cc3ccccc3)CC2)n1
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?