| 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} |
| 388 | DF | .~.~ Benzene ring attached indirectly to the cyano group by acyclic nonionic bonding {5} |
| 404 | DF | .~.~.~ Having -C(=X)-, wherein X is chalcogen, attached indirectly to the cyano group by nonionic bonding {2} |
| 406 |  | .~.~.~.~ Oxygen bonded directly to carbonyl (e.g., carboxylic acid esters, etc.) {1} |
| 407 | DF | .~.~.~.~.~> Three-membered carbocyclic ring containing |