CCOc1ccc(-c2nc(C(N)=O)c3c(n2)n(-c2ccc4c(c2)OCO4)c(=O)n3CC)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?