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

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Ninhydrin reaction with amino acids:

When ninhydrin reacts with an -amino acid, the following sequence occurs:

1. Ninhydrin oxidizes the amino acid → CO₂ + aldehyde + reduced ninhydrin (hydrindantin)
2. The liberated –NH₂ (from the amino acid) reacts with another molecule of ninhydrin
3. The reduced ninhydrin (hydrindantin) condenses with the ninhydrin–NH₂ complex

Ruhemann's Purple:

The product is a purple dye formed by condensation of:
- One molecule of reduced ninhydrin (hydrindantin)
- On

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