| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 276 | | BORON OR COMPOUND THEREOF {5} |
| 277 | DF | .~> Oxygen containing {3} |
| 284 | DF | .~> Nitrogen and hydrogen containing {1} |
| 286 | DF | .~> Hydrogen and metal or ammonium containing {2} |
| 289 | DF | .~> Binary compound (e.g., boride, etc.) {5} |
| 298 | DF | .~> Elemental boron |