NC(=O)CC(NC(=O)Cc1cccc2ccccc12)c1ccc(NCCc2ccccc2F)c([N+](=O)[O-])c1
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?