| 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} |
| 389 | DF | .~.~.~ Non-carbon atom in acyclic chain between the benzene ring and the cyano group {3} |
| 390 |  | .~.~.~.~ Nitrogen in the acyclic chain {3} |
| 391 | DF | .~.~.~.~.~> Carbon, also in the chain, double bonded to the nitrogen |
| 392 | DF | .~.~.~.~.~> Having -C(=X)-, also in the chain, bonded directly to the nitrogen (wherein X is chalcogen) {1} |
| 394 | DF | .~.~.~.~.~> The chain nitrogen bonded directly to the benzene ring {1} |