COc1ccc(C2C(C#N)=C(N)Oc3c2c(=O)oc2ccccc32)cc1Cn1cc([N+](=O)[O-])cn1
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?