COCc1cc(C)nc(OCC(=O)N/N=C/c2cc(C)n(-c3c(C)cccc3C)c2C)c1C#N
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?