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Atetrapeptide on complete hydrolysis gav...

Atetrapeptide on complete hydrolysis gave Alanine, Glycine, Leucine and valine . It never gave Ala-Gly and Val-Ala on partial hydrolysis. How many such tetrapeptides are possible ?

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GRB PUBLICATION-BIOMOLECULES, POLYMERS, PRACTICAL ORGANIC CHEMISTRY AND CHEMISTRY IN DAILY LIFE-SUBJECTIVE TYPE
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