Description4-oxo-4H-pyran-2,6-dicarboxylic acid.svg Русский: Хелидоновая кислота Date 17 June 2013 Source Own work Author BattlePeasant Permission (Reusing...
Description3-hydroxy-4-oxo-4H-pyran-2,6-dicarboxylic acid.svg Русский: Меконовая кислота Date 14 June 2013 Source Own work Author BattlePeasant Permission...