The formula drawn by you is OK.  /CH3O/3C6H2-CO-O-CO-C6H2 /OCH3/3 which means, the trimethyl gallic acid anhydride is 3,4,5 trimetoxibenzoic acid anhydride.

Regards, R.S.

Deepak,

I believe your structure is correct.  The anhydride of trimethylgallic acid is formed from two molecules of the acid.  An analogy is the formation of acetic anhydride from two molecules of acetic acid.

The formula drawn by you is OK.  /CH3O/3C6H2-CO-O-CO-C6H2 /OCH3/3 which means, the trimethyl gallic acid anhydride is 3,4,5 trimetoxibenzoic acid anhydride.

Regards, R.S.

Thanks to John, Rastislav and Ali. Do you know from where I can order this chemical?

I guess  Merck, Lambda, Aldridge or similar suplier might have it, or order it for you.

R.S.

Okay, thanks Rastislav for your nice suggestion.

please find the attachment herewith for further perusal.

That´s the correct structure. Why do you doubt it?

Dear Adrian,

Thanks for the supportive answer. I am not aware who has doubt for the same. As the respective person has not given any clarification kindly ignore the same.

I was tried to show this structure directly by availing computer software's to save the time of researcher from download, open etc.

it is fine

Thanks.

3,4,5,trimethoxybenzoic acid anhydride

5-hydroxy-3,4-dimethoxy-2-methylbenzoic anhydride

See http://www.chemicalbook.com/ChemicalProductProperty_EN_CB1272611.htm