The probability of the correctness of this formula is supported
by the possibility of the following derivatives: monomethylellagic
acid, C'14H'6O'7(O.CH'3); dimethylellagic acid,
C'14H'4O'6(O.CH'3)'2; tetramethylellagic acid, C'14H'2O'4(O.CH'3)'4;
phenylhydrazinellagic acid, C'14H'6O'8.N'2H'3C'6H'5.

By the electrolytic reduction of ellagic acid, hexoxydiphenyl,
(OH)'3C'6H'2-C'6H'2(OH)'3, is obtained; the ordinary
methods of reduction yield leucoellagic acid, C'14H'10O'8, which
crystallises in small sharp needles, melting with decomposition
at 294 -295 C. Leucoellagic acid is soluble in ethyl and methyl
alcohols, and in glacial acetic acid, insoluble in chloroform,
benzene, toluene, carbon tetrachloride, and petrol ether; it
gives a bluish-green colour with ferric chloride which quickly
turns black. Leucoellagic acid is soluble in alkalies, the
solution assuming a deep-red coloration; it reduces silver
nitrate in the cold, but is not adsorbed by mordanted cotton
cloth, in which respect it differs from ellagic acid.[Footnote: Liebig's
_Ann_., 1912, 394, 249.

ELLAGITANNIC ACID, C'26H'28'O'10-3H'2O, is closely related to ellagic
acid; the former consists of faintly yellow needles, M.P. 329 -336 C.
It is soluble in water, precipitates gelatine, and is adsorbed by hide
powder. It occurs with gallic acid, tannin, and ellagic acid in
dividivi, myrabolams, algarobilla, and chestnut wood extracts.

Other bodies of this class include:--

METELLAGIC ACID, Cl_4H_6O_5, derived from methoxybenzoic acid, and