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Aspartame, an artificial sweetener, is a dipeptide aspartyl phenylalanine methyl ester. The structure of aspartame is Ph OH O H 2 N Phenylalanine HO OH O H 2 N Aspartic acid O Structures of phenylalanine and aspartic acid are given below.

1. HO O H 2 N O Ph OMe O N H
2. H N HO O H 2 N O OMe O Ph
3. H N Ph O H 2 N OMe O OH O
4. H N Me O O H 2 N O H O Ph

Correct answer: H N HO O H 2 N O OMe O Ph

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