CC(Nc1nc(-c2ccc(F)cc2)cs1)c1nc2cc(Cl)c(N3CCCCC3)cc2n1CCOCCO
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?