Q82: Which of the following Vitamin contains the ‘Corrin ring system’? - Enzymes, Vitamins and Hormones - Biochemistry- ICAR JRF/SRF 2024 | Agrigyan

• Corrin Ring System: The core macrocyclic framework of Vitamin $\text{B}_{12}$ (Cobalamin) consists of a corrin ring containing four reduced pyrrole rings linked directly (lacking one methine bridge present in porphyrin) coordinated to a central cobalt ($Co$) ion.
• Comparative Rings: Vitamin $\text{B}_1$ (thiamine) contains thiazole and pyrimidine rings; Vitamin $\text{B}_2$ (riboflavin) contains an isoalloxazine ring; Vitamin $\text{B}_6$ contains a pyridine ring.

Correct option: (4) Vitamin By