Cc1ccc(NC(=S)N(CCCN2CCCC2)Cc2cccn2Cc2ccc(Cl)cc2)cc1Cl
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?