| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 462 | DF | HALOGEN OR COMPOUND THEREOF {10} |
| 491 | DF | .~ Binary compound containing metal {6} |
| 495 | DF | .~.~ Group IIIA metal or beryllium (Al, Ga, In, Tl, or Be) {1} |
| 496 | ![]() | .~.~.~ Utilizing carbon or carbon containing compound |