| 562 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {41} |
| 840 | DF | .~ Carboxylic halides (i.e., compounds having the -C(=O)-halo group) {11} |
| 853 | DF | .~.~ Plural -C(=O)-halo groups attached indirectly to each other by nonionic bonding {2} |
| 854 | | .~.~.~ Preparing utilizing phosgene |