CC(/C=C/c1ccc(N(C)C)cc1)=N\N=C(/N)SC1CC(=O)N(c2ccc(C(=O)O)cc2)C1=O
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?