| 570 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 101 | DF | .~ HALOGEN CONTAINING {21} |
| 216 | DF | .~.~ Processes of preparing, purifying, or recovering unsaturated compound {12} |
| 231 | DF | .~.~.~ Addition reaction of free halogen or hydrogen halide to carbon to carbon unsaturation {1} |
| 232 | | .~.~.~.~ To triple bond {1} |
| 233 | DF | .~.~.~.~.~> To acetylene |