加拿大C/D/N ISOTopes 公司于创办于1993年，主要以生产同位素标记化合物为主，目前该公司已超过3000多种标样产品，而且每年新开发的品种也不断地增加。同位素浓缩和化学纯度和质量达到国际上的最高标准。
CDN主要：
Amino Acids
Buffers & Reagents
Controlled Substances
Detergents
Drug Precursors
Environmental Standards
Fatty Acids
Flavours & Fragrances
Gases
Medical Research Products
Nucleic Acid Bases & Nucleosides
Pesticides & Pesticide Metabolites
Pharmaceutical Standards
Polyaromatic Hydrocarbons
Polychlorinated Biphenyls
Spin Labels
Steroids
Alcohols & Phenols
Aldehydes & Acetals
Amides & Imides
Amines & Amine Salts
Carboxylic Acids & Salts
Esters & Lactones
Ethers & Oxides
Halides
Heterocycles
Hydrocarbons - Alicyclic
Hydrocarbons - Alkanes
Hydrocarbons - Other Aliphatic
Hydrocarbons - Other Aromatic
Hydrocarbons - Polyaromatic
Ketones & Ketals
Nitriles
Nitro & Nitroso Compounds
Phosphorus Containing Compounds
Silicon Containing Compounds
Sulfur Containing Compounds
Tin Containing Compounds