| 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} |
| 579 | DF | .~.~ Ethers {11} |
| 671 | DF | .~.~.~ Acyclic {7} |
| 672 | | .~.~.~.~ Polyoxy {3} |
| 673 | DF | .~.~.~.~.~> Carbon to carbon unsaturation containing {2} |
| 676 | DF | .~.~.~.~.~> Halogen containing {1} |
| 678 | DF | .~.~.~.~.~> Hydroxy containing (H of -OH may be replaced by a Group IA or IIA light metal) {2} |