CCn1c(Cn2nnc(-c3ccccc3)n2)nnc1SCC(=O)Nc1ccc(C(C)=O)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?