Cc1ccccc1NCC(=O)N/N=C/c1c(C)c(C(=O)c2ccc(Cl)cc2)n2ccccc12
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?