What is the chemical structure and identity of biotin?

Label:chem

Topic
Biotin (vitamin B7) is a heterocyclic organic compound from the B-vitamin group; its structure was determined in 1942 by Vincent du Vigneaud.
Answer
Biotin is a heterocyclic organic chemical compound with a system of condensed imidazolidine and thiolate rings attached to an alkyl chain terminated by a carboxyl group (valeric acid chain). Its molecular formula is C₁₀H₁₆N₂O₃S and only the D-(+)-biotin isomer is biologically active.
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