CCc1c(C)sc(N=C(S)N2CCN(C(=O)C3CCCO3)CC2)c1C(=O)OC
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?