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A tripeptide on complete hydrolysis prod...

A tripeptide on complete hydrolysis produces glycine, alanine and phenylalanine in `1 : 1 : 1` molar ratio. What are the probable structures of the tripeptide?

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These three amino acids can be obtained from six tripeptides and these are Gly-Ala-Phe, Gly-Phe-Ala, Ala-Gly-Phe, Ala-Phe-Gly, Phe-Ala-Gly and Phe-Gly-Ala.
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