| 2900 | ORGANIC CHEMICALS | |
| 2901 | Acyclic hydrocarbons |  Ontological structure of 2901 |
| 2902 | Cyclic hydrocarbons | Ontological structure of 2902 |
| 2903 | Halogenated derivatives of hydrocarbons | Ontological structure of 2903 |
| 2904 | Sulphonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated | Ontological structure of 2904 |
| 2905 | Acyclic alcohols and their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2905 |
| 2906 | Cyclic alcohols and their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2906 |
| 2907 | Phenols; phenol-alcohols | Ontological structure of 2907 |
| 2908 | Halogenated, sulphonated, nitrated or nitrosated derivatives of phenols or phenol-alcohols | Ontological structure of 2908 |
| 2909 | Ethers, ether-alcohols, ether-phenols, ether-alcohol-phenols, alcohol peroxides, ether peroxides, acetal and hemiacetal peroxides, ketone peroxides (whether or not chemically defined), and their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2909 |
| 2910 | Epoxides, epoxyalcohols, epoxyphenols and epoxyethers, with a three-membered ring, and their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2910 |
| 2911 | Acetals and hemiacetals, whether or not with other oxygen function, and their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2911 |
| 2912 | Aldehydes, whether or not with other oxygen function; cyclic polymers of aldehydes; paraformaldehyde | Ontological structure of 2912 |
| 2913 | Halogenated, sulphonated, nitrated or nitrosated derivatives of products of heading 2912 | Ontological structure of 2913 |
| 2914 | Ketones and quinones, whether or not with other oxygen function, and their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2914 |
| 2915 | Saturated acyclic monocarboxylic acids and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2915 |
| 2916 | Unsaturated acyclic monocarboxylic acids, cyclic monocarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2916 |
| 2917 | Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2917 |
| 2918 | Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2918 |
| 2919 | Phosphoric esters and their salts, including lactophosphates; their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2919 |
| 2920 | Esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives | Ontological structure of 2920 |
| 2921 | Amine-function compounds | Ontological structure of 2921 |
| 2922 | Oxygen-function amino-compounds | Ontological structure of 2922 |
| 2923 | Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids, whether or not chemically defined | Ontological structure of 2923 |
| 2924 | Carboxyamide-function compounds; amide-function compounds of carbonic acid | Ontological structure of 2924 |
| 2925 | Carboxyimide-function compounds (including saccharin and its salts) and imine-function compounds | Ontological structure of 2925 |
| 2926 | Nitrile-function compounds | Ontological structure of 2926 |
| 2927 | Diazo-, azo- or azoxy-compounds | Ontological structure of 2927 |
| 2928 | Organic derivatives of hydrazine or of hydroxylamine | Ontological structure of 2928 |
| 2929 | Compounds with other nitrogen function | Ontological structure of 2929 |
| 2930 | Organo-sulphur compounds | Ontological structure of 2930 |
| 2931 | Other organo-inorganic compounds | Ontological structure of 2931 |
| 2932 | Heterocyclic compounds with oxygen hetero-atom(s) only | Ontological structure of 2932 |
| 2933 | Heterocyclic compounds with nitrogen hetero-atom(s) only | Ontological structure of 2933 |
| 2934 | Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds | Ontological structure of 2934 |
| 2935 | Sulphonamides | Ontological structure of 2935 |
| 2936 | Provitamins and vitamins, natural or reproduced by synthesis (including natural concentrates), derivatives thereof used primarily as vitamins, and intermixtures of the foregoing, whether or not in any solvent | Ontological structure of 2936 |
| 2937 | Hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by synthesis; derivatives and structural analogues thereof, including chain modified polypeptides, used primarily as hormones | Ontological structure of 2937 |
| 2938 | Glycosides, natural or reproduced by synthesis, and their salts, ethers, esters and other derivatives | Ontological structure of 2938 |
| 2939 | Alkaloids, natural or reproduced by synthesis, and their salts, ethers, esters and other derivatives | Ontological structure of 2939 |
| 2940 | Sugars, chemically pure, other than sucrose, lactose, maltose, glucose and fructose; sugar ethers, sugar acetals and sugar esters, and their salts, other than products of heading 2937, 2938 or 2939 | Ontological structure of 2940 |
| 2941 | Antibiotics | Ontological structure of 2941 |
| 2942 | Other organic compounds | Ontological structure of 2942 |