CC1=C(C(=O)Nc2cccc(C(=O)N3CCC(C(N)=O)CC3)c2)SCCO1
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?