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Carnosine Synthesis

BIOCHM-Z1GBPE

A number of sports nutrition companies add $\beta$-Alanine to their supplements as a way to increase the overall concentration of carnosine in the muscles to reduce fatigue during strenuous exercise.

Carnosine has a number of biological benefits as well, but it suffers a short half-life in the body.

The schematic below showcases the synthesis of carnosine.

Based on the schematic, structure A must be

, which would make structure B

.

The incorporation of structure A would result in structure C being

.