Cc1ccc(CCNC(=O)C2CCN(S(=O)(=O)c3ccc4nc5c(c(C(=O)O)c4c3)CCCC5)CC2)cc1
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?