| 568 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {4} |
| 300 | DF | .~ OXYGEN CONTAINING (E.G., PERCHLORYLBENZENE, ETC.) {11} |
| 420 | DF | .~.~ Aldehydes {8} |
| 446 | | .~.~.~ Unsaturated alicyclic ring containing {1} |
| 447 | DF | .~.~.~.~> 2,6,6-Trialkylcyclohexenyl (e.g., vitamin A derivatives, etc.) |