CCCCC(NC(=O)Cc1c(C)c2cc3c4c(oc3c(C)c2oc1=O)CCCC4)C(=O)O
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?