| 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} |
| 303 | DF | .~.~ Ketones {10} |
| 305 | | .~.~.~ Nitrogen containing {2} |
| 306 | DF | .~.~.~.~> Benzene ring containing |
| 307 | DF | .~.~.~.~> Acyclic |