Cc1cc(C)nc(N/C(=N/C(=O)c2ccccc2C)NCCc2c[nH]c3ccc(Cl)cc23)n1
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?