Answer: cyanocobalamin

AnswerCrossword Clue
cyanocobalaminvitamin B12, which has a large and complicated molecule, in one form including a cyanide group, in all forms including a cobalt atom also CYANOCOBALAMINE
cyanocobalaminA vitamin found in foods of animal origin such as liver, fish, and eggs, a deficiency of which can cause pernicious anemia. It contains a cyanide group bonded to the central cobalt atom of a cobalamin molecule