Predict the major product for the following reaction. 
Definitions:
Vitamin B12
An essential nutrient required for the production of red blood cells and maintenance of the nervous system.
Dermatitis
Inflammation of the skin.
Nutrition During Pregnancy
The dietary recommendations and practices aimed at ensuring an optimal intake of nutrients vital for the health of the pregnant person and the development of the fetus.
Protein
Large biomolecules consisting of one or more long chains of amino acid residues, essential for the structure, function, and regulation of the body's tissues and organs.
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