CCn1cc(C(=O)O)c(=O)c2cc(F)c(N3CCN(C(S)=Nc4ccc(OC)cc4)CC3)cc21
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?