CCOCCn1ccc2c(OCC(=O)Nc3cc(OC)ccc3OC)cccc2c1=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?