A chemical reaction in which organic compounds are synthesized from their building blocks is called

Dehydration Synthesis

Explanation:

DEHYDRATION (chemical), a chemical process consisting of  taking away one or more molecules of water by some chemical  connection. The process opposite to dehydration is hydration, ie. the addition of one or more water molecules to a chemical compound. Dehydration produces unsaturated compounds, such as olefins, ketones, and nitriles.

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