New purines in B12 vitamins.
D000225:Adenine / Q000031:analogs & derivatives; D006801:Humans; D011687:Purines; D014805:Vitamin B 12; D014815:Vitamins; D014970:Xanthines / Q000032:analysis*
D011687:Purines; D014815:Vitamins; D014970:Xanthines; D000225:Adenine; D014805:Vitamin B 12; C030985:purine
ADENINE/derivatives; VITAMIN B12; XANTHINES/determination