CCCCC(NC(=O)Cc1c(C)c2cc3c(C)c(C)oc3c(C)c2oc1=O)C(=O)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?