The molecule is a class of hydrolysable tannins obtained by condensation of the carboxy group of gallic acid (and its polymeric derivatives) with the hydroxy groups of a monosaccharide (most commonly glucose). It derives from a gallic acid.
[(2R,3R,4S,5R,6S)-3,5-dihydroxy-4,6-bis[(3,4,5-trihydroxybenzoyl)oxy]oxan-2-yl]methyl 3,4,5-trihydroxybenzoate