title: Recent advances in the chemistry of natural products.
mesh_terms: D003035:Cobalt; D004988:Ethers, Cyclic; D008722:Methods; D008745:Methylation; D013237:Stereoisomerism; D014805:Vitamin B 12 / Q000138:chemical synthesis*
chemical_list: D004988:Ethers, Cyclic; D003035:Cobalt; D014805:Vitamin B 12