CCn1c(CNC(=O)c2ccc(OC)c(OC)c2)nnc1SCC(=O)c1ccc(OC)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?