CC(C)OP(=O)(OC(C)C)C(NC(=O)c1cccc([N+](=O)[O-])c1)C(N)=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?