Acid hydrolysis of vitamin B12 yields 5,6-dimethylbenzimidazole,1 5,6-dimethylbenzimidazole-1 --D-ribofuranoside,2 and its 2or 3-phosphate,3Dg-1 -amino-propanol-2,4 ammonia,6 and a red cobalt fraction.6 Comparable hydrolysis of crystalline pseudovitamin Bi27 does not give 5,6-dimethylbenzimidazole nor any derivative thereof. Hydrolysis with 1 M HC1 at 100°for 2.5-12 hours yields adenine, a purine tentatively identified as hypoxanthine, a ninhydrin reacting material cor-
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