Cc1ccnc(NC(=O)CCC(=O)N(CC(=O)NCCc2ccccc2)Cc2cccs2)c1
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?