Hydroxocobalamin is a vitamin B12 precursor used medically to treat vitamin B12 deficiency and certain cyanide poisonings. It is a yellow-to-orange, water-soluble compound that binds cyanide and forms cyanocobalamin for excretion. As a noun in medical contexts, it denotes a specific cobalamin derivative with hydroxyl and cobalt-containing ligands. The term is commonly encountered in clinical literature and pharmacology.
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