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The first total synthesis of nakadomarin A.

(-)-Nakadomarin A is a member of manzamine alkaloid isolated from a marine sponge and have a unique hexacyclic structure. The first total synthesis of (+)-nakadomarin A, an enantiomer of natural product, has been accomplished from stereochemically defined 4-oxopiperidin-3-carboxylic acid derivative. The synthesis established the structure of nakadomarin A including absolute configuration.