O=C(Cn1c(=S)[nH]c2ccccc2c1=O)N1CCN(c2ccc(F)cc2)CC1
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?