COc1cc2[nH]c(=O)n(CCC(=O)NCCCN3CCN(c4ccccc4F)CC3)c(=O)c2cc1OC
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?