Cc1cc(=O)cc2oc3cc(N)c(-c4c(C)cc(O)cc4O)c(C)c3nc1-2
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?