CCn1c2ccccc2c2cc(/N=C3\SC(CC(=O)Nc4ccccc4OC)C(=O)N3CCOC)ccc21
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?