CCCCCCCCCCCCCCCCOP(=O)([O-])OP(=O)(O)OCC1OC(n2ccc(N)nc2=O)CC1O.[Na+]
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?