| 1/00 | Compounds containing elements of the 1st Group of the Periodic System |
| 1/02 | Compounds containing elements of the 1st Group of the Periodic System Lithium compounds |
| 1/04 | Compounds containing elements of the 1st Group of the Periodic System Sodium compounds |
| 1/06 | Compounds containing elements of the 1st Group of the Periodic System Potassium compounds |
| 1/08 | Compounds containing elements of the 1st Group of the Periodic System Copper compounds |
| 1/10 | Compounds containing elements of the 1st Group of the Periodic System Silver compounds |
| 1/12 | Compounds containing elements of the 1st Group of the Periodic System Gold compounds |
| 3/00 | Compounds containing elements of the 2nd Group of the Periodic System |
| 3/02 | Compounds containing elements of the 2nd Group of the Periodic System Magnesium compounds |
| 3/04 | Compounds containing elements of the 2nd Group of the Periodic System Calcium compounds |
| 3/06 | Compounds containing elements of the 2nd Group of the Periodic System Zinc compounds |
| 3/08 | Compounds containing elements of the 2nd Group of the Periodic System Cadmium compounds |
| 3/10 | Compounds containing elements of the 2nd Group of the Periodic System Mercury compounds |
| 3/12 | Compounds containing elements of the 2nd Group of the Periodic System Mercury compounds Aromatic substances containing mercury |
| 3/14 | Compounds containing elements of the 2nd Group of the Periodic System Mercury compounds Heterocyclic substances containing mercury |
| 5/00 | Compounds containing elements of the 3rd Group of the Periodic System |
| 5/02 | Compounds containing elements of the 3rd Group of the Periodic System Boron compounds |
| 5/04 | Compounds containing elements of the 3rd Group of the Periodic System Boron compounds Esters of boric acids |
| 5/05 | Compounds containing elements of the 3rd Group of the Periodic System Boron compounds Cyclic compounds having at least one ring containing boron but no carbon in the ring |
| 5/06 | Compounds containing elements of the 3rd Group of the Periodic System Aluminium compounds |