COC(=O)c1[nH]c2cccc(OC)c2c1NC(=O)CN1CCC(C(N)=O)(N2CCCCC2)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?