Cc1cc(C)cc(N2C(=O)/C(=C/Nc3ccc(N4CCOCC4)cc3)C(=O)NC2=S)c1
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?