The correct structure of Rhumann's Purple,the | vedclass

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(A) The reaction of ninhydrin with amino acids or proteins leads to the formation of a deep blue or purple colored compound known as Rhumann's Purple.

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(A) The reaction of ninhydrin with amino acids or proteins leads to the formation of a deep blue or purple colored compound known as Rhumann's Purple. The structure of Rhumann's Purple consists of two indane$-1,3-$dione moieties linked by a nitrogen atom,where one of the carbonyl oxygens is deprotonated (exists as an enolate). Comparing the given options with the standard chemical structure of Rhumann's Purple,option $A$ represents the correct structure where the nitrogen atom connects the two indane rings,with one oxygen atom carrying a negative charge $(O^-)$ and the other carbonyl groups intact.

The correct structure of Rhumann's Purple,the compound formed in the reaction of ninhydrin with proteins is :

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