CN(Cc1cnc2nc(N)nc(N)c2n1)c1ccc(C(=O)NCCCC(=O)O)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?