| 556 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {3} |
| 400 | DF | .~ SILICON CONTAINING {19} |
| 465 | DF | .~.~ Carbon attached directly or indirectly to the silicon by nonionic bonding (e.g., silanes, etc.) {5} |
| 466 | DF | .~.~.~ Processes {8} |
| 474 | | .~.~.~.~ Silicon to hydrogen bond formed |