Which of the following water-soluble vitamins structurally features both a pyrimidine ring and a sul — Biomolecules Chemistry Question

💡 Solution & Explanation

Vitamin $B_1$ (Thiamine) has the molecular formula $C_{12}H_{18}N_4OSCl_2$. Structurally, it is unique among the B-complex vitamins because it contains both a pyrimidine ring and a sulphur-containing thiazole ring. Its deficiency leads to Beri-beri.