O=C1NC(=S)N(Cc2ccc(F)cc2)C(=O)/C1=C/NCCCn1ccnc1
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?