| 568 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {4} |
| 18 | DF | .~ SULFUR CONTAINING {9} |
| 38 | DF | .~.~ Thioethers {5} |
| 39 | DF | .~.~.~ Oxygen containing {6} |
| 45 | DF | .~.~.~.~ Plural oxygens containing {3} |
| 46 | DF | .~.~.~.~.~ Polyhydroxy {1} |
| 47 | | .~.~.~.~.~.~ Plural rings containing {1} |
| 48 | DF | .~.~.~.~.~.~.~> Plural rings bonded directly to the same sulfur |