COCCn1c(Cc2ccccc2)nnc1SCC(=O)Nc1oc(C)c2c(C)nnc(O)c12
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?