维生素B12又叫钴胺素，是一种含有3价钴的多环系化合物，4个还原的吡咯

Vitamin B12 is also called cobalamin. It is a polycyclic compound containing trivalent cobalt. 4 reduced pyrrole rings are joined together to become a corrin macrocycle (similar to porphyrin), which is the only metal containing Elements of vitamins. Vitamin B12 is a red crystalline powder, odorless and tasteless, slightly soluble in water and ethanol, most stable under weak acid conditions with a pH value of 4.5～5.0, strong acid (pH

Vitamin B12, also known as cobalt amine, is a polycyclic compound containing 3 cobalt, and four reduced pyridoxine rings are linked together to become a grunt ring (similar to nicotin), the only vitamin containing metallic elements. Vitamin B12 is a red crystalline powder, odorless and odorless, slightly soluble in water and ethanol, the most stable and strong acid (pH) under pH of 4.5 to 5.0 weak acid conditions

The only compound containing a large ring of vitamin B13, which contains a cobalt ring, is also known as a macrocyclic compound. Vitamin B12 is a red crystalline powder, odorless and tasteless, slightly soluble in water and ethanol. It is the most stable under the condition of weak acid (pH 4.5-5.0)<br>