Cc1ccc(NC(=O)Cn2c(=O)n(-c3ccccc3)c(=O)c3ccc(C(=O)NCc4ccc5c(c4)OCO5)cc32)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?