CCC(C)N=C(S)N1CCN(Cc2ccc3c(c2)OCO3)CC1.O=C(O)C(=O)O
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?