CCOC(=O)CC[C@H](NC(=O)c1nc[nH]c1[N+](=O)[O-])C(=O)OCC
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?