Cc1ccc(OCc2cc(C(=O)N3CCc4[nH]cnc4C3c3ccccn3)no2)cc1C
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?