| 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} |
| 367 | DF | .~.~.~ Plural alicyclic rings containing {1} |
| 368 | | .~.~.~.~ Polycyclo ring system {3} |
| 369 | DF | .~.~.~.~.~> Tetracyclo ring system (e.g., homo steroids, etc.) {2} |
| 373 | DF | .~.~.~.~.~> Tricyclo ring system |
| 374 | DF | .~.~.~.~.~> Bicyclo ring system |