Cc1ccc2c(=O)cc(C(=O)Nc3sc4c(c3C(=O)NCc3cccnc3)CCCC4)oc2c1C
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?