| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 414 | DF | CARBON OR COMPOUND THEREOF {3} |
| 415.1 | | .~ Oxygen containing {5} |
| 415.2 | DF | .~.~> Percarbonate compound |
| 416 | DF | .~.~> Carbonyl {1} |
| 418.2 | DF | .~.~> Carbon monoxide |
| 419.1 | DF | .~.~> Carbonate or bicarbonate {5} |
| 437.1 | DF | .~.~> Carbon dioxide or carbonic acid {2} |