"Pyrogallol" vs. "Pyrogallol A"

Hello, The Pyrogallol is not available in my city, but in a chemical store there is a "Pyrogallol A". The salesperson could neither tell the difference between them nor to draw the chemical formula of the "A" modification.

Does anybody know what is "Pyrogallol A"? What is its formula? Is it suited for film development and has it the properties of usual Pyrogallol?

Thanks

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