meta-digallic acid
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digallic acid — (ˈ)dī+... noun Etymology: International Scientific Vocabulary di + gallic 1. : a crystalline phenolic ester acid C14H10O9 obtained as a decomposition product of tannins or made synthetically and yielding two molecules of gallic acid on hydrolysis … Useful english dictionary
Digallic acid — meta depside bond digalloyl ester IUPAC name 3,4 dihydroxy 5 (3,4,5 trihydroxybenzoyl)oxybenzoic … Wikipedia