.gamma.-Pyrone-2,6-dicarboxylic acid 2,6-Dicarboxyl-4-pyrone 4-Oxo-1,4-pyran-2,6-dicarboxylic acid 4H-Pyran-2,6-dicarboxylic acid, 4-oxo- 99-32-1 CHELIDONIC ACID Compound XI* (Cherry and Hageman) Compound xi* Jerva acid Jervaic acid Jervasic acid NSC3979 WLN: T6O DVJ BVQ FVQ