[Total synthesis of vitamin B12].
D000478:Alkylation; D000577:Amides; D055598:Chemical Phenomena; D002621:Chemistry; D002794:Choline / Q000138:chemical synthesis; D008745:Methylation; D010777:Photochemistry; D011166:Porphyrins / Q000138:chemical synthesis; D014805:Vitamin B 12 / Q000138:chemical synthesis*
D000577:Amides; D011166:Porphyrins; D002794:Choline; D014805:Vitamin B 12