Cc1nc2c3ccccc3nc(NNC(=O)CCC(=O)NCCN3CCN(c4ccccc4F)CC3)n2n1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?