CCCCCCCCCCCCCCCCCCNc1nc(=O)n(C2CC(O)C(COP(=O)(O)OCC3OC(n4ccc(N)nc4=O)C(O)C3O)O2)cc1F
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?