Nc1c(C(=O)c2ccccc2O)cnn1-c1ccc(S(=O)(=O)N2CCOCC2)cc1[N+](=O)[O-]
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?