CCc1ccc(-n2c(SCC(=O)N3CCC(C(=O)O)CC3)nnc2-c2ccncc2)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?