Cc1cc(O)nc(N/N=C/C2=C(N3CCOCC3)/C(=C\c3ccc(Cl)cc3)CC2)n1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?