CCN=C(S)N(C)CCc1cc2c(c(OC)c1C=C1C(=O)N(C)C(=O)N(C)C1=O)OCO2
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?