CCOc1ccc(C(C(=O)NCC2CCCO2)N(Cc2cccc(OC)c2)C(=O)c2snc(C(N)=O)c2N)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?