Translations:Cyanocobalamin/16/en

B
_12r and B
_12s can be prepared from cyanocobalamin by controlled potential reduction, or chemical reduction using sodium borohydride in alkaline solution, zinc in acetic acid, or by the action of thiols. Both B
_12r and B
_12s are stable indefinitely under oxygen-free conditions. B
_12r appears orange-brown in solution, while B
_12s appears bluish-green under natural daylight, and purple under artificial light.