CCCNC(=S)N/N=C(\C)c1ccc(S(=O)(=O)N(C)c2ccccc2)cc1
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?