CCOC(=O)c1c(NC(C)=O)sc2c1CCC(/C=N/CCCN(CC)CC)=C2Sc1ccccc1
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?