| 562 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {41} |
| 808 | DF | .~ Phosphorus halides (i.e., compounds having halogen attached directly to phosphorus by nonionic bonding) {6} |
| 820 | | .~.~ Forming phosphorus to carbon bond |