Fc1ccc(Nc2nc(Oc3ccc4c(c3)OCO4)nc(N3CCOCC3)n2)c(F)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?