CCc1c(C)c2ccc(OC(C)C(=O)NC(Cc3c[nH]c4ccc(O)cc34)C(=O)O)c(C)c2oc1=O
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?