| 558 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {21} |
| 303 | DF | .~ Nitriles (i.e., compounds having cyano bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {21} |
| 435 | DF | .~.~ Acyclic (e.g., purification of saturated nitriles, etc.) {9} |
| 452 | DF | .~.~.~ Nitrogen attached indirectly to the cyano group by nonionic bonding {4} |
| 454 |  | .~.~.~.~ Plural cyano groups bonded directly to the same chain (e.g., adiponitrile, etc.) {3} |
| 455 | DF | .~.~.~.~.~> The chain contains nitrogen (e.g., iminodiacetonitrile, nitrilotriacetonitrile, etc.) |
| 456 | DF | .~.~.~.~.~> Purification or recovery of saturated hydrocarbon dinitriles (e.g., from mixtures with cyanocyclopentanonimine, 2-cyanocyclopenten-1-ylamine, etc.) |
| 457 | DF | .~.~.~.~.~> A carbon in the chain is multiple bonded to carbon (e.g., 1,4 dicyanobutene, etc.) |