CCc1ccc(C(C)NC(=O)/C(C#N)=C\c2c[nH]nc2-c2ccccc2)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?