The molecule is a uronic acid that is beta-D-glucuronic acid in which the hydroxy group at position 4 and the hydrogen at position 5 have been eliminated with the introduction of a double bond between positions 4 and 5. It is a uronic acid and an alpha,beta-unsaturated monocarboxylic acid.
(2R,3R,4S)-2,3,4-trihydroxy-3,4-dihydro-2H-pyran-6-carboxylic acid